As long as you get a 3gen or newer, you should be fine as long as you don't fire over-pressure loads (ie, hot handloads) or get sloppy about brass inspection if you reload. The small unsupported part of the chamber significantly helps feeding, but it used to be too deep --I understand they changed this angle with the 3gen.
In mine, I have seen rounds bulge significantly, but that was due to the sloppy manufacturing of the RBCD ammo I was trying out. It bulged so bad it would have bulged around the rim anyway with a "fully" (which none of them are) supported barrel.
The Glock barrel is fine. The .40 is a good round, but it is high pressure compared to similar rounds in the same size package. Just stick with good factory ammo for carry like the Winchester T series or such, and only use your own reloads that you know were done properly. I'd also recommend just reloading the minimum charge necessary for target practice as this will reduce wear and tear and also minimize the possiblity of a problem. I say this because some component manufacturers recommend against reloading for this particular weapon --but I and many others have never had a problem as long as you follow safe reloading habits, and like I said, keep the pressure down by loading only target loads for this weapon (reason being the brass is less likely to fail due to stress from sizing "Glock'd" brass).
Some of what you hear are rumors, some true and accidental, and I'd bet the vast majority of KB's are the result of operator error (most likely in loading). The best "proof" is annecdotal at best, so take it with a grain of salt. I've seen the top straps of big Smith revolvers blown all the way off, seen and held 'em (fortunately not when it happened) --how many of those do you hear about?
If this pistol (and analogues) were really that big of a problem, it wouldn't be carried by half the cops in the US. They don't typically use reloads, so I bet poor reloading practices are the source. Too many full power .40 loads stress the same brass more than any other round I have reloaded --so only reload light target loads, and again, inspect your brass.
