Yeah, think there have been 20ish leaks since February. Up to FD19 now I believe.
F=year D=Month, 19 is the day.
Few bugs, biggest issue most are annoyed by is the notification bug. Lose sound notifications if you get or make a call and hit back or home right away. Wont occur if you allow the device to just back out of call screen on its own. Some, like me, have noticed better speeds/signal with the latest modem.
Worst issue is there have been a lot of bricks due (guessing, no one has nailed it down as far as I know) some changes between gb and ics kernels and the data partition. Bet bet for installing ICS leak is to Odin or flash the EL29/26 custom kernels and go from there. Wouldn't recommend using touch recovery from ROM manager to do it. Not saying it IS the culprit, but was involved it a lot of the bricks.