I was surpised at how well the touch and pen work - so well I have never bothered to hook up the included bluetooth keyboard. The experience is great especially with IE9, OneNote, and Outlook.
Having the pen for notes and drawing is great. The integrated Watcom digitizer is very precise and the handwriting recognition is pretty amazing and fast. Palm rejection works.
While it isn't as small as the iPad having full Windows and the big display gives you full access to Outlook, everything on web, PC games, and so on. Between the fast processor and the SSD everything feels very responsive.
With IE9 the bigger screen and touch combine to make for a fantastic browsing experience.
Battery life is consistently about 4 hours. When I use it intermittently during meetings it lasts me through most days. Heavy use and I have to plug it in at some point.
One minor design issue: if you use without the included case the edges feel sharp in your hands.
Overall it is pretty amazing that you can get a high-end tablet PC with a Core i5, multi-touch, Watcom pen input, and an SSD for just over $1000.