I've tried Blade-Tech, Uncle Mike's, & KyTac & I like the polymer holsters...smooth & fast IMO.  I like the KyTac the best but its also expensive like the SideArmor.  They are all easy to clean.
I've seen some come with a lining inside to avoid harming the finish on the firearm but thats a bit much for me.

Haven't had any problems with my KyTac & he custom makes each one by hand...not off of some production line so it is a perfect fit for your firearm.  Holster plus two mag carriers for $110.00...not bad I guess considering just the holster alone from SA is $65.00?

Maybe you can borrow one from someone & try before you plunk down 70.00?  

Also, it is appropriate that you have a polymer holster for your polymer framed firearm!

IMO you won't go wrong with the Sidearmor IWB.  I carry a G-23 daily in one with 20 degree forward cant loops and love it.  Believe it or not, a kydex holster is actually more comfortable than leather, it is thinner.  Good luck.

Aimless, I have one for my G36 and love it. I have the 15 degree cant (I think). I wasn't real excited spending that much on a holster either, but I think that it is worth it. And their customer service is outstanding.

Jamie