I've found a curious bug in LPQ and 3: if you have a long alert tone in calendar (I use 15 minutes of Nyan Cat Jazz, because I use it to wake me up according to my schedule), the tone file keeps playing after you dismiss the notification. I need to reset my phone to banish Nyan Cat. This didn't seem to happen in LP7 and, while it is intermittent in LPQ and 3, it's very frequent.
The calendar in LP7 was difficult for other apps to hook into. Setting Profiles was unable to lookup the calendar. Simple Calendar widget had UI customisation issues (couldn't change font sizes).
TWLauncher is unstable as hell.
Touchscreen sensitivity is terrible on LP3, good on LP7 and I wasn't on LPQ long enough to notice.
Luckily LPR is a fantastic baseband for i9100T and I'll use it from now on but battery life on LPQ,3&7 is astonishingly bad. I'm hanging out for a proper release of ICS (LDx) otherwise it might be back to LA4.