I know quite a few people with this particular gun, and I have one as well (though I'm selling it today). Though some people have reported problems, I have not experienced any. The armorer for the USMC DET-1 unit feels that maybe the extractor design is a little on the short side, which might account for some problems. I wish there was a truly definitive answer as to why some guns had problems. I've heard everything to it being a design flaw in the original part, which had been rectified with an upgraded part, to some guns having weak springs, to the design being plain bad.
I suppose you a few options. Get the TLE/RL II, and take the chance. Shoot the heck out of it right away until you feel confident with it's reliability, and send it to Kimber if it is unreliable.
Or, get a Warrior with the traditional internal extractor.
Or, get a used Kimber series 1 gun, and put an add on rail on it.
Or, go with a Springfield Armory MC Operator, TRP Operator, or find a used one (Mil-Spec, Loaded, whatever).
I would not feel handicapped by the TLE/RL II. I like all the options it comes with. Good luck.