I have been a Glock user for about 12 years now. I have owned 6 Glocks, but I currently only have one, a G21SF.
The ones I owned in the past were:
G19 - I loved this gun, unfortunately I had to sell it when I was really broke. I will get another one ASAP.
G21 - I liked this one, but the grip was just a tad too big, so I sold it. My new G21SF fits me much better.
G23 - I sold this one shortly after I bought it. I just could not warm up to the .40 cal.
G26 - I liked this little gun, but I found I carried the G19 more, and the little "baby Glock" just wasn't getting used. It got traded away towards a rifle. I may get another one, just because it's so darn cute.(I can't believe I said that!)
G34 - I was going to use this as a competition gun, but I never got into any competition. It was a joy to shoot, accurate(I could shoot a 1" group at 25yds with it if I did my part), and light recoil(felt like a .22). I may get another one, but I'm not sure.
Then my 6th Glock is of course the G21SF already mentioned. Of all the ones listed above, I miss the G19 the most, and that is one I will definitly be replacing. It's just such a great carry gun.
I have owned a lot of different pistols, but I always seem to go back to Glocks. They just plain work.