I am using UD7.0 with the ChevyNo1 10-slot 1200MHz kernel from 6.3 with no ill effects.
I also re-uploaded my framework-res.apk and services.jar to alter the color of the clock and text on the notification bar with no ill effect either. Now, I am about to back up my apps, then figure out if I really want to flash over to Koshik's 5.0.4.2 CM mod....
Hell, yeah, I am an addict - I am always trying newer, bigger, better, faster ROMs lol....