With the keys good for at least a year, and the two computers I installed the Beta on running like a dream, I'll probably install the RC on all my home computers and get genuine licenses as I can.
Installed it and it's great to have. Sure it is Windows Vista R2 but it is successful at getting my computer less hot than Vista due it's optimised system resource usage.
"Most user friendly Windows OS ever built" so far as they claim and I say "YES!" to that :)