Just say no
It sucks in so many ways. A half bodge with normal functionality removed.
If you want a Windows tablet, have a look at the Asus Slate. BUT it is not a light tablet, it is a full power i5 4Gb RAM tablet, so is basically a laptop without the keyboard and a touchscreen instead.
Downside to the asus slate is the £1000 price tag.
There won't be many Windows tablets till Windows 8 next year which will work on a different processor and be more tablet friendly.
Another option (no idea on spec/performance) is the Lenovo X series (I think). The screen rotates around to turn into a tablet.
What software do you need to use? Any chance of using an android tablet with remote desktop to your main PC?