I've had my 15-22 since the end of January. It's one of the 2nd generation with the flash suppressor.
Just get a kick out of putting that on a .22.
I've found it doesn't care for Federal all that much. Does like CCI, and Winchester. Haven't had a problem with Remington, but it was all Vipers (pretty hot).
You have to pay attention to loading the magazines. It's easy to mis-stack the rounds which will call cause failures to feed.
It is just too much fun to shoot.