Well, I played with it for 2 days and turned it over to my boss. Windows 8 isn't too bad. I initially tried it on laptop a couple months ago, and gave up on it after a week. But with the touchscreen and my love for my Lumia 920, I am starting to dig Win 8 desktop. My boss is kinda psyched to learn it as well.
So, the Taichi. Very nice, polished Ultrabook. My boss got the i7, 4 gigs of RAM, and a 250 gb SSD. The backlit keyboard is perfectly useable. I am not a touch typist, but it felt good. There are 2 USB 3 ports, a mini HDMI and a Mini Display port. The power brick is built into the plug, and the cord must be about 8 feet long. This is definitely a high end device, and it shows.
The screen on the inside is not a touchscreen, a fact that I had to keep remembering when my swipes did nothing. The outside touchscreen is pretty ok, not quite as responsive as, say, an iPad, but not bad either. My only real gripe is with the capacitive windows button, it just had terrible response to touch. The touchscreen also has a digitizer, and the Taichi comes with a powered (AAA battery) pen. The digitizer worked great, and was fun to use. Win 8 is able to cancel out your palm when using the pen, so that was nice.
I played around with annotating PDF files, both with touch and the stylus. It worked reasonably fine, but I think I still prefer my iPad for this. Since it is a 16:9 screen, my standard sized PDF files displayed slightly smaller than they do on the 4:3 ipad. And the apps for this are much more feature rich on the iPad (Goodread, PDF Expert and iAnnotate). The rest of the machine works as you would expect a high end windows machine to work.
I think I may try the Lenovo Helix when it comes out for myself, I like the idea of the detachable tablet more than my boss does. For me the Taichi would never make sense to hold in tablet form, just too heavy. But flat on the desk it was fun to use in tablet mode.
For $1500, I would recommend getting an iPad and a touchscreen Ultrabook. But I already have an iPad, so I'll try the detachable Helix and see how it goes (since work is paying).