Well I got my 5.7 MKII through gun broker and shot 100 rounds of ss197 through it.
No functional problems.
Gun appears well built. Ergonomics are fine for me... I normally wear a L to XL glove. The funny index finger safety location is actually pretty easy to operate.
Sights needed 1 click windage and the elevation was on with a 6 o'clock hold at 50 yards. I gave it 4 clicks down for a COM sight picture and it was zero'd.
Accuracy was good. I was shooting a 8 or 10 inch gong at 100 yards and could hit it almost every time rested on a bench. I was able to make many hits on it standing as well.
Downside? Trigger sucks ass for a single action. In fact the only single action triggers I can remember ever being as bad were on CZ handguns. I was expecting a good trigger as that is what I kept seeing in reviews, however mine blows. It has a fair bit of take up, no problem, then comes up hard, then has a solid 1/8" of somewhat gritty creep, then comes up hard again, then breaks. May as well be a Glock or XD trigger. It is reasonably light though, perhaps that is what some shooters think qualifies as "a good trigger"?
If the creep were glass smooth like a 3 gun AR trigger I could live with it, that is how I have my 10/22 speed gun setup. But I don't know if it will self smooth over time or not. I haven't had luck with that on other guns.