Summary: Overall, we were happy with the Lenovo Thinkpad Twist Convertible Ultrabook. It met its main needs and went a little bit beyond with the quality of the multi-touch screen. The keyboard layout was what you would hope for in a laptop.
Conclusion: The Lenovo ThinkPad Twist (3347-4HU) ultrabook convertible is really a clamshell laptop convertible tablet like the ones that Lenovo has been making for the past half-dozen years. It's the natural evolution of the Tablet PC concept of the mid-2000s, in 2012 ultrabook form.
Pros: Convertible tablet form factor. More storage than SSD-only convertibles. Both TrackPoint and trackpad. Good keyboard. Optional WWAN.
Cons: Bulky. Only five touch points. Mini HDMI instead of full-size HDMI port.