I've been running the stock LiquidE_1.100.05_EMEA final build for about a week now and haven't noticed any major problems. Definitely stable. One thing that I personally find annoying is haptic feedback isn't completely turned off in the dialer, swipe unlock, and answering phone swipe. It's turned off everywhere else when the setting is unchecked.
Battery life is about the same as 1.6, default launcher is slightly jerkier (maybe it's just me), but I installed helixlauncher replacement and it's as fast as 1.6 again. Audio is quieter, but from someone else who did a spectrum analysis, it's MUCH better than 1.6.
Camera app is a big improvement. I like the touchscreen shutter button, easier to press than the hardware button, plus it doesn't add additional shake when snapping a photo.