I have a friend that has one, they are really fun to shootm if you like the AR platform.
We've taken it squirrel hunting a few times, it does the trick.Personally I just bought a .22LR conversion kit for my S&W MP15. I have yet to take it out to the range to give it a go, but my original S&W AR rifle has had flawless operation. Roughly 3000 round through it and only 2 misfires(bad rounds I think).