Lenovo swapped my K1 Ideapad out after a mutitude of problems and gave me brand new Thinkpad 64gb tablet (plus the pen). It came with ICS and it's been pretty good so far.
It's almost stock except for that app wheel thing (which I never user use). I have noticed a bit of a lag when scrolling through the screens, and the stock browser is slow (Chrome and Dolphin run fine on it) but all and all pretty good.
Don't want to sound greedy, but I'm hoping for a Jellybean update in the furure but I'm not getting my hopes up LOL!