Joel -
I have one in 7.62x39. I really love shooting it, but it definitely has it's quirks.
I removed the 'scout' rail and put on a traditional Weaver rail (removing the rear sight). The muzzle brake is embarrassing and not necessary, but apparently almost impossible to remove.
I picked up a '3D' printed mag for it, which works far better than the original. The original tends to allow rounds to nose dive into the mag when you are cycling the action. Not life threatening, but not fun either. A quick flick of the finger on the back of the round straightens it up.
Never had an issue with any surplus or mil ammo not firing.
Barnaul ammo was very accurate, always under or about 1" for 3 shots at 100m. Tough to find these days though.
What works very well is to 'reload' cheap steel case ammo. You pull the bullets, measure and even the powder charges, then put in a Hornady 123gr SP or SST bullet. Someone on this forum suggested this, and it works very well. I usually get about 3/4" groups with this type of loading, plus you're not buying primers. Very cool.
Pretty hard to find these days and probably not as nice as the Ruger American Ranch, but also not $900.