awesome and accurate! Just don't use dirty 22lr in it.. I found after 100 rounds of thunderbolt it starts misfiring. It also wont cycle anything but high velocity rounds.
With all that said, I've put thousands of rounds of CCI minimags through it and it's easily the most fun you can have with a 22lr (in Canada anyway!) Do yourself a favor and get a front grip for it first.. helps with the weight and feel,