Thanks for the info, I need to research this more. Was not aware it replaced the trigger as well. That might make it worth it right there. I don't like that hinged thing.Well, APEX trigger replaced the hinged trigger with a lever-style trigger, and since I HATE the hinge, that was a big help. The machined parts reduced the spongyness in the pull and grittiness in the reset. The RAM made the reset that much easier to feel.
Seriously, the difference is huge. I've heard that XD has the best trigger out of the barrel, but that Glocks is easiest to tune without buying parts. Personally, I'm happy with my M&P + Apex.