I need some advice on purchasing a Peavey 5150 212 combo. This is also would be first tube amp in general.

I know next to nothing about them other than I remember people saying they can be ungodly loud for 60 watts and that some people have a hard time getting a tone they like. That last bit could be something I've misremembered. So anyway, what's the general consensus on them. Anything I should look out for?

The amp is located at a store about 3 hours from me so there isn't a whole lot of being able to sit and get comfortable with it. The pictures look good. Here are some of the details

It has been cleaned and retubed
Has the foot switch
$799

I'm not sure the age but I have the serial number.

My main amp is an old L9 Lab series and all I do these days is piddle around with a Les Paul studio and plan on getting a strat if that helps any. What do you guys think?

What are you looking to do with it?

Music styles?

Are you able to play loud, or will you need to keep it more quiet (and, even if able, do you really want to play loud all the time)?

Music is just hard rock. I could play a little loud and probably not all the time. I’ve heard these things really get in to a good sound at high volumes which if is true that would kind of suck.

Don't worry too much about how loud it will be when using an amp with a master volume.  I know some people complain about not getting great sound from tube amps at lower volume but the only time I turn my stuff up is when I'm recording using an isolation cabinet.  Sure they sound better cranked but you can usually dial in a sound or two you like, and you can always toss an EQ pedal in the effects loop to tweak it even more.

If it makes the sounds you like (tons of youtube samples of 5150s) it isn't too bad of a deal.  
I think you'd be able to find a tone you like as long as you don't have to play under speaking volume all the time.  That would be lame.

Since it is a 5150 I'd venture that means pre 2005 when Peavey renamed them to 6505.  USA made on all of them.

Depending on how much gain and volume you like you might want to have a noise gate (I do on mine).
edit:  when you play it check with humbucker and single coil guitar if possible (if you have both), make sure there isn't so much noise that it will drive you nuts, as there will be some at high enough gain/volume levels.

That seems pricey for a 5150 combo.
The peavey 6505 is the same amp with a different name.
I think you can do better.
If you have a Guitar Center anywhere near you, you can buy
From them, and have it shipped to your local store for free.
Just go pick it up when it arrives. Also, you can return it and get your money back
If it doesn't work out. I think you get 45 days.
Also, if you haven't played through any of the 5150 series,  be prepared
For a LOUD experience.
The old 5150 2X12 is 60watts. 60 TUBE watts.

Yeah maybe you can talk them down OP?
https://reverb.com/marketplace?query=peavey%205150%20212
https://reverb.com/marketplace?query=peavey%206505%20212

A 6505MH (mini head, 20-25watts, all tube) with a 2x12 cabinet might be around that price or a bit lower too.  If not looking for full volume.

I had one for about 4 years, and as much as I wanted to hang onto it as a cool amp, I wound up selling it.  I paid $450 for it, and sold it for $450, so yours seems overpriced.
It was LOUD, like insanely loud, and I couldn't even turn it up above "1" in my house with anyone else home.  I never could get a tone I liked out of it.  It would do heavy distortion for sure, but it always seemed too fuzzy and ice-pick ear-piercing, no matter how I tweaked it.  Decided I didn't need a 90 lb object I never use, so I sold it, to some metalhead with a headstock-less 8-string fanned-fret guitar.  Seemed to suit him better.

Edit:  Oh yes, a noise gate is essentially, it was a hissy amp.  I didn't have a noise gate.  I don't personally think it's a good bedroom amp.

I appreciate the input from everyone. I think I may pass on it. Everything I’m reading is it is insanely loud. I already have an old Marshall cab so I may look in to a lunchbox style tube head or see if I can’t find one much cheaper

If you've already got a cabinet (112?  212? 412?) It's going to make things simpler.
The 20watt lunchbox heads are awesome! They move a LOT more air than you might think.
The 6505 mini head is switchable from 20w to 5w down to 1w. So quite tameable.
Also consider other heads. There are a shit ton of options out there for a solid rock head.
If you can find one, the Jet City JCA22H is a 20 watt tube mini head designed by Mike Soldano and sounds awesome!
They turn up all the time for really decent prices. People turn their noses up at them because it's not a "real Soldano",
But who cares. It sounds great!
Humble brag. when they were still around, you could order a Jet City amp , and have it mpdified by Mike and the guys in Seattle!
I got one modded with Mercury Magnetics transformers, and a couple of other mods from the guys at Soldano.
I wouldn't sell it for the world. It will move some air through a Marshall 412 , and sound GREAT doing it.

I had one. It was loud. Real loud.

However, with an attenuator you can play it at a reasonable level, and still get that sought after tone.

Mine was one of my favorite amps I've ever owned. The tone was exactly what I was looking for. The only amp I liked better was my Soldano 50 watt.

It sounds like you are talking one of the old 90s-early 2000s ones.

I have a sig logo original and a 6505+, both heads.

They are great amps, but they have to be cooking to get them in "the zone", the power tubes like to see some compression as well as the speakers like to be pushed. They are a bit fizzy at low volumes.

The combos are HEAVY AS SHIT (like 90lbs). The cleans are mediocre, and it really only does the mid-high gain thing, which it does do well.

And $799 seems high to me for a combo (heads sell for more now I believe) but I haven't really kept track.

Unless you are playing metal or trying to get VH Balance tones I think you would be better served with something else. I've got one of those little Marshall DSL20 heads, they are pretty sweet and will make nice tones across a wider gain range at lower volumes with your existing cab.

Depending upon age, if you plan to play out with it, you should consider replacing the electrolytic capacitors, or at least having them inspected for swelling/leakage.  Also, if you plan to play out with it, consider obtaining a dolly or installing casters on the bottom of it.  The "carry handle" is a cruel joke, much like the one on my Peavey TNT bass amp.

If it still has the original Sheffield 1200 /"5150" speakers you will find they tend to be fizzy at low volume, high distortion, especially with the bright switch on, and/or the presence and treble cranked up.  These speakers/drivers were made to be:

1.  Affordable.
2.  Durable in handling and transport.
3.  Live a long life under high volume, high distortion assault.

Turning up the volume, leave the "Bright" switch off, take it easy on the presence and treble knobs and you should be fine.

Make sure you get the foot switch with it or prepare to shell out another $75 or so.

Bear in mind most of my experience is based on a 5150 II head into a 5150 cab, but very similar circuits and the same speakers in a 4X12 cab, so should be close enough.  The "green"/clean channeld should be able to get you into "JC800" - AC/DC territory with the gain cranked, the "red"/lead channel should have more gain than you could ever need, but an SD-1 or Tube Screamer in front will help tighten up the sound if you are going for more modern "djent" metal stuff.  Hope this helps.

There is also a recently discontinued 6505 1X12 combo - also 60 watts.  Can find for $500 - $700.

Had one for several years...wish I never sold it.  

1.  It's LOUD!!  It's way too loud for a practice amp...it's designed (and sounds better) turned up so you can get the tubes singing.
2.  It's heavy!!  
3.  It's kind of a one trick pony.....the clean channel isn't that great, the gain channel is made to well...be high gain and chunky sounding.

I loved mine...but I used to play in a rock/metal cover band. It was perfect for what I used it for.

It's an amp that's designed to be taken to clubs...played live and loud.

I had one of those before my current amps, a 6505+ 112.  Sold it so a friend's kid could have a good amp to try to be serious with his band.  

If you replace the stock speaker it sounds great, not as heavy either.

Had one. Heavy AF, And yeah, it was loud. That said, I wish I still had it. That price I'd ok, but I've seen them cheaper lately.