I have fed mine ALL manner of ammo...both quality and cheapie garbage...no issues. It's a bit complicated to clean, but how often you need to clean it depends on ammo quality.
I get the best results with CCI ammo...mini-mags and velocities give me consistent 1" groups at 50 yards (off bags) with no trouble hitting pop cans at 50-70 yards of the shoulder.
The size and weight make it feel like a full size military rifle with a 22 conversion kit installed.
I bought a repro Stg44 sling off of eBay...looks and feels right.
No scope on mine...the iron sights are decent and very precise. Love the nostalgia of carrying and shooting this rifle.
Buy one, and love it!