Our CEO got one at the launch yesterday and handed it over for testing so I've been playing with it since then. It's a very solid device, they did a nice job on it. The UI is better than anything on the market IMO. A lot of major apps aren't available yet, but it's a new platform and even Microsoft couldn't avoid that problem. It's hard to attract developers until they know you have numbers, unless you pay them.
There's a chance they might sell a lot of these based on word of mouth, or maybe the new devices don't catch on, who knows. I like using it a lot.