I have a G23 and a G26. Both have performed flawlessly as have my Rugers (P95 and P944). I use many brands of ammo in all of them, have not found anything, yet, that any of them will not digest. Accuracy is great with all four, reliability has been terrific.
The main 'scares' with Glocks all seem to involve reloads, both commercial and otherwise and the 40S&W cartridge (high pressure round). Some of the bad press is the same incident(s) repackaged several times because something of this nature makes for great gossip and good fodder for the insecure "if I don't own it, it must be a POS" groupies.
If you reload your own and are meticulous in your measures and settings, you should have no problems. You may want to keep away from non-jacketed bullets, frequently check the bore for fouling or get an aftermarket barrel with conventional rifling.
Personally, I don't reload. I used to, but after splitting the cylinder on a Ruger BlackHawk, I gave it up. My attention to details leaves something to be desired. For the sake of safety, I disposed of my reloading equipment years ago.