Ran the latest 2.24 for the Nexus for a couple days. It's working really well, actually. Leeech and magiman7 are doing great work with it. Very smooth, fast. Themes do work now, though I had to do a battery pull after changing themes. I used Nova Launcher for the ICS launcher, which I like a lot right now. It's almost to the point of being able to use, for me, as a daily driver.
That being said, I restored a backup of GummyNex 7.6 that I was running for a couple weeks before. Until themes are easily switched on MIUI, I'm not quite ready to jump.
Don't listen to people who say MIUI is just 'to look like an iPhone'. Those people don't know that you can theme every aspect of MIUI to look however you want (go search for MIUI themes to see what I mean). There's Sense themes, ICS themes, etc.
Anyhow, my .02.