Like monster said, it's pretty easy to switch ROMs. Just backup and wipe everything first. For me, I'd been a huge UD fan for a while but he's slowed down on updating his ROMs and they hadn't been running all that well on my phone since 3.1. Liquids newest (well, I'm running 1.8 now) has been a huge improvement, and the OC'd kernel that comes with it is great. Give it a shot!