Hey folks,
I just installed Jellybean on my Asus Transformer TF101 from here:
http://forum.xda-developers.com/showthread.php?t=1779133
I can say that it is pretty damn awesome! I don't use the tablet for anything serious except reading my work manuals (all on PDF) so decided to leap into it.
It seams very stable (no crashes so far) and is very buttery alright. The browser seems vastly improved with speed and smoothness.
Cheers, Matt.