I agree with Swampwolf that safeTblock is better for a pocket, type carry, but I'd suggest still holstering it. I also find the safeTblock adds an extra second to the time to shoot, even with second nature training. Secondly, I feel a holster and firearms retention course is much better alternative, as it does not effect the speed of the draw and fire, it does not corrupt the functionality of the firearm (extra cause for malfunction), and provides a much better chance to keep from getting shot by your own weapon either by accident or by a bad guy. Everybody has their own application, style and level of comfortability, so choose whats right for you. If you feel safe combining the training, holstering, and safetblock, then do them all!
For DetroitStudent is this your first gun? Have you alot of experience with shooting? With a .45acp?
If its your first, and you have some experience but not a ton, Id suggest the G19. I have nothing against the .45 and will be adding the G30 to my lineup next, but the G19 is an incredible first glock to get good with. Ammo is cheap and with the lower recoil, you'll shoot more, longer. And you wont develop as many bad shooting habits as shooting a caliber that is more powerful than you should.
Good luck, and stick with a glock, you wont reget it!
AMPRECON - have you tried an aftermarket barrel? I had the problem with my G23 and dropped in a aftermarket barrel (barsto I think) and the round sits fully up to the extractor ridge.. solved the issue for like $150! Check around with the .45acp crowd and see what works best for them.