Kramer's stuff works!
I had the good fortune to meet Greg Kramer and got to see him work and check out his shop 15 years ago. He gave me a Kramer paddle holster for my Glock 19 and 15 years later, it still retains my Glock like a champ and has endured daily rigors and wear. This was my first quality holster, and I never looked back.
I have two Kramer paddle holsters (1 in horsehide, the other in cowhide) and both are awesome specimens of what paddle holsters should be. He has a belt loop sewn into the body of the paddle so you can affix it to your belt to make sure the holster stays where it's supposed to when you draw, not be a part of your draw and end up out of your pants.
A few months ago, I bought another one for the Glock 23 3rd generation pistol (the Glock 19 was a 2nd generation and I didn't want to try to force the 23 into it and ruin the mold and grip it has on the 19). Still in the process of breaking it in, but so far, so good. Give his product a shot; you can find them used and reasonably priced on just about any gun forum in existence. I sorely doubt you'll be disappointed.