Got CM9 on my Samsung GT-P1000, and despite it being a nightly build, it's actually way more stable and way smoother than stock Gingerbread firmware. The only concern I have with it is the lack of the dock by default (had to get Apex Launcher just for it - which also brought smoother menu animations) under a stupid excuse that "it's a tablet, it doesn't need a dock". That's BS, a 7'' tablet is great with a dock... and I saw Nexus 7 having a dock, so I hope CM10 adds that by default too. Other than that, I only miss a few Samsung apps (they had an amazing music player that had the best layout EVER) and that's it. I recommend Cyanogenmod for anyone who isn't too afraid of some rooting/flashing (despite all the alleged dangers, it's just like flashing a BIOS... get the right stuff, don't disconnect power and you're fine).