Installed Stunner Beta 4.3 ICS ROM last night, the general consensus on xda is that this is the best ICS ROM so far. It's my first look at ICS on the note and I have to say I was very impressed by the look and feel. Very swish. You can change many things in the settings too, including DPI and you can enable ICS tablet mode. Pretty much all features work including camera, video recording, market etc.
http://forum.xda-developers.com/showthread.php?t=1552554
Installation was relatively painless once I'd spent an hour or so reading. You need to revert to a stock (rooted) ROM, flash a Chinese leaked Samsung ICS upgrade and then flash the ROM.
Didn't keep it for long though because many Apps (with data) don't restore correctly with Titanium. Would have meant going through manually setting up everything, I'd really need to set aside a day to do this.
Trying to revert back to Gingerbread was a total disaster though. I figured I could just flash my Nandroid backup but noooooo... it doesn't quite work like that. I managed to balls things up pretty well trying that. Couldn't boot into the ROM, couldn't reflash the ICS rom, couldn't really do anything in recovery. In the end I had to use PC ODIN to flash a stock GB ROM, reinstall Clockworkmod and then restore my nandroid. Including reading and stressing this is took about 4 hours in total!
So all in all, if you're desperate for ICS the ROM looked great, just make sure you have the time to install and setup all your essentials. And absolutely, definitely, read up beforehand how to revert back to GB just in case you don't like it.