I got a S&W 622 w/ 4.5" barrel which is a Alum version of the 422. I like it. Its a bit tricky to take apart, but not hard, you just need a 22 shell and your mag.
I look mine out to the range yesterday and was getting about 2" at 15m, but could be becuase of me. Trigger wasn't bad, felt nice in my hand, the flame from the round shoots out of every orphus and looks super cool.
But you gotta make sure that ALL the screws are tight, Lock Tite them. I had mine out and the screws loosened out and it seperated a bit and well wile shooting it it bent the frame a bit. ALSO dont shoot velcorapters (SP) in them, I nearly blew up my 22LR I only fired about 5rds but I believe that was what cased my gun to seperate and blew off the rear sight.
Overall its not a bad gun, I heard they are problemmatic but I only put 200rds through mine.
Would I buy another one. Maby not.
Mags arn't cheap, cheapest I could find them were 28 USD + taxes and shipping. But Ive seen them go for cheap as 200$ to 300+