I had the package on my desk when I got home from the range yesterday ... now I'm chomping at the bit to get back out and put this through its paces :-D
Still a little unsure what kind of contortions may be needed to clean this beast now (without removing the comp) but I couldn't be happier with the setup. I plan to "adjust" my JMCK and Safariland holsters with a heat gun this week and plan to hit the range this weekend or first of next week - can't wait!
I finally got to the range last night. Short report... awesomeness with a small asterisk

150 rounds through the gun and the comp was great. No movement with the tiny bit of red loctite I used and shooting with it is noticeably flatter. Highly recommended. My carry gun will be getting one post haste.
Also gave the CZ Custom mag extensions a whirl... here one is on my carry gun:

I managed to get 20 rounds into the mags with them and had no issues feeding. That small asterisk gets added because I did not get consistent slide lock back on empty. I'm using the stock mag springs, though so maybe I need something stronger. That is a small matter, though. Overall I really liked them.
I did manage to dislodge the fiber in my front sight somehow - it was hagning out the front end of the front sight at the end of the session - but I'm chalking that up to the hasty job I did of installing it initially LOL The gun has had about 1300 rounds through it with the same fiber so maybe it was just time...
It was a fun range trip!