I personally have switched to ICS twice now, and am about to go back to GB again. I had JT's build 3 a while back, but there were a bunch of issues. Right now, I have Teamhacksung's Build 6 (following the reccommended upgrade path stock->build2->build 6). MMS doesn't work well. There are all these random phantom softkey presses, most noticeable being back button, leaving you with programs closing by themselves. Haptic feedback only seems to work with the softkeys and sometimes random apps but mostly you get no feedback. The compass doesn't work, leaving you with a less than perfect google navigation. It is pretty smooth, but without full, stable functionality it kinda leaves my hardware feeling under-appreciated and me feeling frustrated. Too bad, it's got some good features.
Thats strange I dont have any of those issues at all. My MMS works perfectly. I dont have any haptic issues at all. Maybe do a fresh odin with re-partition to your phone and try again. I would never go back to CM7 since i have tasted ICS.
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