Well, it looks nice to me. Their airweight and snub guns have always been built well, and they do usually have good triggers. Three pounds? If so, that's good. You'll have something that you can shoot better than the 80% or better of LEO's that are probably carrying DAO autos.
On wear - yes, aluminum will wear faster - But -consider that a .22 should last for tens of thousands of rounds if taken care of, that S&W, as long as they're around, will take care of the gun, and that aluminum is FAR better than the polymer stuff that many LEO's are carrying.
You won't win any matches with it, but it should work just fine out to 25 yards, and with that nice glowing front sight, you'll be better off than most at twilight time.
Plus, if you ever want a carry gun (please don't carry the .22), you can get an airweight .38, and already be comfortable with it.
Sounds like a good choice to me.