I've got one of the 22-4's. I bought it a few weeks ago. Its okay for a modern revolver. It shoots okay, but doesn't really do much for me. The concept is excellent. A .45 ACP revolver is still on my wish list.
All I can say is that I wish S&W would go back to actual steel (no MIM), hammer mounted firing pins, and no locks. Make a classic gun like this actually look and feel like a classic gun.