Love my Phoenix Arms HP22a. I've got both barrels and it's a blast to shoot! Pretty damned accurate too.
My only caution is you must use standard velocity .22lr's. There have been reports of frames cracking using higher velocity rounds.
Mine has run great right out of the box with just a minimum amount of mag tweaking with well over 1000 rounds through it.
Lifetime warranty too. Fortunately, I haven't had occasion to use it.