I recently bought a glock 19. Here is my own personal pro/con analysis. I've owned the following guns, all of which were sold and now the newly acquired glock 19 is my only pistol.
Stoeger Cougar
Sw99c
Walther PPS
Pros
1.) Weight - I carried my cougar mostly, and the glock's weight is heaven in comparison. Loaded it weighs a few less than the cougar unloaded.
2.) Size - The grip length is a half inch shorter which helps with concealing tremendously.
3.) Capacity - Same capacity as my cougar, yet a half inch shorter in the grip.
4.) Consistent trigger - this is subjective but I like the consistency of the same trigger pull every time.
5.) Price - Relatively inexpensive compared to other guns. Also mags are $23/ea shipped online through CDNN. Mags are big one for me as I think it's ridiculous to spend hundreds of dollars on a gun and then have to cough up $40+ per mag on top of it.
6.) Reliable - Haven't had any fte/ftf, just seems to work. Didn't have any issues with the PPS or sw99c, but the cougar wouldn't run well without a good lube job.
Cons
1.) Feel - To be honest all the other guns listed above have felt better in the hand, the sw and cougar felt better to shoot as well. Went shooting with bros today, one has a PX4 storm, the other has a P2000. Both felt better in the hand, both felt a little nicer to shoot. Don't really care for how my hand feels with the Glock after shooting a few hundred rounds (and this is with a hogue grip)
2.) Sights - I'm not a fan of the standard sights. I'm getting used to them but I prefer 3 dots. I'll most likely buy some night sights in a few months.
Conclusion:
I feel like the glock is the ideal gun for me to carry due to its size, weight, capacity, price, and reliability. It's not the gun that feels the best to me, however I'm willing to sacrifice that in order for the big picture of what the gun has to offer.