Glocks are excellent pistols. Very reliable and accurate.
It's a great tool that everyone should own.
Half the handguns I own are Glocks and I've drank the kool-aid long enough to even own some .45GAP handguns.
However, the biggest change I would like Glock to do is...
... make the next generation of Glocks with interchangable backstraps, since some of the biggest complaints is how the grip feels.
My carry guns vary due to clothing options and weather conditions...
Glock Model 30
Glock Model 39
S&W Model 325PD