I had one, great little guns. Only issues are mags are expensive and the factory sights are a joke. Luckily, OEM Glock sights fit perfect. Stuttered a little with bulk .22 at first, but after putting about 100rds of CCI Stingers through it and a good cleaning it ran 100% with anything.
I have one, it had to go back for some repairs to correct FTF and FTE issues.
It still not 100%.
It really prefers hot .22 ammo for the best functioning.
It would make a good trainer for a full size Glock.
I have one also, great little gun. My wife loves it for practice. The only issue I've had is with the type of ammo. Find the one that works best in your gun and only use that from now on. I'm using Remington thunderbolts and Wolf Match in mine.