Fast, and docks still available.
FYI - for anyone on the fence about upgrading to 4G (like I was): I put in for the upgrade last Wednesday, received the mailer box the next day. I put off backing the Xoom up till the weekend, very sad to see my Xoom go away for possibly a week.
I mailed it off on Monday, they received it Tuesday, worked on it & shipped it Wednesday, & I received it, with dock, on Thursday- so while they say "expect to be without it for five business days", at least in my experience it was only four, and while they say docks are available while supplies last, at least as of right now supplies are lasting.
Now, where's my ICS?