Hi!
I've been running a .357 6" For quite a few months. I've run approximately 4000 .38spl target loads and maybe 1000 moderate .357s through it. I never did bother changing out the spring or the grips, just cleaned it up, and ran it. Often it has been run by new people to the shooting sports, to no ill effect.
It's never given an ounce of problems, and shoots more accurately than I do. Quite often it has produced 2" groups at 20yards. It could probably do better, even if I can't.
The frame size is loosely equivalent to a S&W K-frame, and K-frame speed loaders do work. That being said for holsters, I have never found one that worked perfectly, Seeing as the Alfa has a full underlug, and K-frames did not. L-frame holsters work okay-ish, but are pretty sloppy in the frame/cylinder area. Standard .38/.357 speed-strips work excellently.
I would consider the stock trigger better than a GP100, but nowhere near as good as an old S&W. That being said, I don't mind a heavy trigger, as long as it's clean and smooth, and it is. While the double-action is heavy it's clean and predictable, and I've never had a light-strike even when running hard primers.
My main criticisms would be, first, the stock grips are way to small for normal or large hands, easily remedied, if I liked wood grips. My other complaint would be the short-ish ejector rod. Not a big issue if you're doing bulls-eye and target work, but in some of the run and gun games, especially when using .357's, the case is significantly longer than the stroke of the ejector, leading to incomplete ejection if you don't get a good 'hit' on the ejector rod. That being said, it's not Chief's Special short, but not Model 28 Long either. Kind of a little too pointy on the end too, can get a little irritating after a while.
All in all, I'm very happy with it. My interest lies in cheap guns and historical guns, so It's right up my alley. I initially wanted to see how much abuse it would take, and didn't even clean it for the first 2000 rounds beyond wiping off the cylinder face and forcing cone. The only thing that came up, around the 2000 round mark, the cylinder base pin gummed up to the point where it almost locked up. A proper cleaning, and it was back in service.
It's not a Smith, or a Colt, but the price is right, and it gets you in the door. Many times people have said, "For only X dollars more, you could get a used _______!" Yup. You can. Eventually. If you keep your eyes open. Or you could have a brand-new Alfa right now. (Well, as right now as the CFO allows....)