It looks nice. I've always considered MIUI to be the marriage of Android's usability with Apple's design...but then I saw Ice Cream Sandwich. Even these screenshots don't dissuade me, as nice as they are.
I have to say, though, that the MIUI team is really good at design.
In my hands:
Phone: LG Nexus 4 (since November 2012), rooted and running stock OEM Android 4.2.1
Tablet: ASUS Eee Pad Transformer + Dock (since November 2011), rooted and running Revolver 4.1.1
-T-Mobile G2/HTC Vision (since October 2010), rooted and running CyanogenMod 9.1
-T-Mobile G1/HTC Dream (since January 2009), rooted and slowly running CyanogenMod 6
-HTC Touch/Vogue (since August 2008), unhacked and running WM 6.1