Flashed Ubuntu Touch on my Nexus 7. The lag was atrocious, most of the apps were either just blank icons which did nothing or a link to a website. Nothing close to customisable, everything on it were example notifications, messages, etc. Similar to a demo, rather than developer preview. Even the calculator app was not actually a calculator, it was a picture of a calculator. The only thing remotely accessible Settings-wise were the notification volume and brightness controls.
Samsung Galaxy S III T999V (d2tmo) | CM 10.1.2 | Stock Kernel | TWRP 184.108.40.206
Google Nexus 7 (grouper) | ParanoidAndroid 3.68 | franco.Kernel r47 | TWRP 220.127.116.11
HTC Amaze 4G (ruby) | CM10 Unofficial by sportsstar89 | Stock Unofficial CM Kernel | 4EXT Touch 18.104.22.168 RC4
HTC Panache/MyTouch 4G (glacier) | Virtuous Affinity 2.05.0 | Modified HTC Kernel | 4EXT 22.214.171.124 RC2
HTC Hero GSM (hero) | CM7.2 Stable | Las Venturas 1.2 | RA-hero-v126.96.36.199