I haven't shot the Alfa Project rimfires but before I got my own 17 I tried four of the other brands. Sadly not Colt or Korth. Hi Standard and H&R older guns from back when they made OK revolvers.
But they are just OK. The S&W blows them all out of the water. Yes the S&W costs 3 to 4 times as much for a 17 but it also delivers accuracy which is limited by the shooter and not the gun. So when you're ready to get better the S&W is ready to carry you there.
The other guns were already shooting worse than me when I bought them. The only one I've kept is the top break H&R Sportsman simply because it's a top break.
The one bright light on the horizon that I'd really like to try is the Ruger SP101-22. Apparently it's got a hard DA pull but that can be helped with a spring kit.
If you're serious about getting a rimfire revolver you really owe it to yourself to be patient and pay the eventual price for the older K22, a Model 17 or a Model 617. The Colt and Korth are the only ones that are arguably better when it comes to a double action revolver. Well, unless Dan Wesson made some in rimfire. But all of these will cost you more to MUCH more than a S&W. So if you're already balking at the cost of the S&W then you can forget about a Colt or Korth or Dan Wesson unless you trip over some sort of once in a lifetime deal.