This is the techie toy du jour amongst the senior manglers in this organisation for which I toil. They are all Compaq machines.
They appear to break easily - we've had one back several times because it stops doing one thing or another which is essential (like recognising the pen ).
The Finance Officer loses pens so regularly his PA has put a piece of string on it and fixed it to the PC. The return of idiotmittens!
They use a lot of processing power to be tablet PCs so even reasonably whizzy boxes crawl occasionally.
The handwriting recognition works, but takes some training.
I reckon they are a generation or two (about three years?) away from being really functional yet. Let the early adopters ride the bleeding edge and push back the foreskin of technology till then.
We have them in some secondary schools (on test) to replace the Bromcom handhelds that teachers use for lesson registration on the wireless network. Saves making / \ marks on paper registers....
Even the butch ones aren't that reliable or very durable....
I have just gor the small Acer Tablet the C112TCI. Seems OK, the handwriting recognition is quite good and it also has a speech recognition program which might be good if you speak like Hugh Grant but is still a lot of fun to see how it interprets what you are saying.
I have onenote but haven't used it enough to give an objective opinion.