I'll admit that I was iffy about repartitioning my Xoom, but after doing so and flashing CM11...holy crap! What a difference, it's like a totally different tablet now!
Here as in this thread or here as in XDA? AFAIK an "official" CM ROM doesn't have the option to move the buttons, but other devs using CM as a base have made those tweaks available.
Must agree with your above comment too, it's like another tablet now. Was thinking about getting a new tablet as my Xoom on 4.2.2 was pretty slow and Larry but now it's flying along.