Blowback pistols aren't really an issue. I prefer a GBB because you actually know when you're out of ammo. But full auto pistols are loads of technical trouble. There have been may threads here on the subject even in my short time in the game (less than 2 years). I've made the decision to avoid them for that reason, even though they're fun as hell to shoot.
And I must say I love KSC Glocks. I have the G17 and I love that piece. Became my main field gun. It's got only light upgrades (tightbore and metal slide & barrel) and it rocks.