Ohhh, Yes you are missing out!!
I have had most of the calibers in one form or the other but the 10mm is now my favorite. It got a terrible rap from the gun raggs and when the FBI down loaded it they almost killed it.
I can't believe these guys didn't see this round for what it is.. The BEST most versatile round you can get!!! It does it all and would be my choice if allowed only one gun. It can be used for hunting, defense and is very accurate so targets beware! The ammo for the 10mm exceeds any other caliber for its variety. From 135gr screamers to 200gr FMJ penetrators.
The only negative I can see is the grip size in the Glock 20s. The double stack mags are wide. It is not for people with small hands or people who feel the need to choke the crap out of the grip. I think the wide grip spreads the recoil better for me though. I have average to large hands and love it. Besides it holds 15rds of 10mm and gets the job done.
I have a Glock 20c and would sell all my other guns before letting it go. The C-models shoot with less recoil than a .40SW and is faster for follow up shots. I plan on getting a 6" barrel for hunting and having it ported.
I also see a lot more interest in this round lately and hopefully more people will recognize it as a great round and get one. That will help to bring the ammo cost down and make it cheaper to practice. I use Blazer 200gr FMJ and at least it is good ammo at a cheap price. You cannot reload them though.
If you like Glocks and want a great 10mm for a reasonable price, I would recommend the 20c. If you need concealability get a 29. Of course if you have small hands and love 1911s a Delta Elite may be more to your liking.
What ever you do, give one a try. You will like it. It's not for beginners but It is great for the experienced shooter. I also recommend letting people try one if you get a 10mm. It is hard for a caliber that took such a beating to get past the "it's obsolete" ideas that seem to be everywhere. It is gaining in popularity and will continue to do so on its own merits, if the gun raggs shut up.
I don't know of any caliber that compares!!