Thoughts? opinions? experiences?

Thinking of getting one. Currently have a Samsung Galaxy S3 and it j has been a great phone. The negative I keep reading about is bad call quality on the Note 4. I use my cell phone as a phone a lot so if this is really an issue I need to know.

Thank you

I never had a problem with call quality on any phone. Not really a voice quality audiophile though. I've had various iPhones and Samsung phones including the Note 4.

Bluetooth headset?

Never had an issue with call quality on the Note 4.  It is a great phone.  Camera is great, screen is great, I haven't found anything to complain about on it yet, except maybe for lack of water/dust resistance.  I had an S5 before the Note 4 but jumped up to the Note after I switched carriers.  The S5 is also an excellent phone, is a bit smaller than the Note 4, and you should be able to get one at a decent price after the rollout of the S6.  Either the Note 4 or the S5/6 would be a very nice upgrade.

Knox

My Note 4 is awesome minus being on Sprint. Coming from an S4 on Verizon.

I have one, Love it and can't use any non-Phablet type phones they are just too damn small.

Mine is good to go...no issues