Ashen (the reviewer of all things awful) has gotten his hands on a "WPad", a no-brand Windows 7 slate tablet PC.
The price is $400 (about £250) but considering how awful it is compared to an iPad (which is £100 more) it's no contest.
You might say it's unfair to judget all W7 tablets based on a review of a particularly low-end model, but remember that W7 tablets are commodity: with the exception of the hardware build quality (which one would expect be better from name-brands like HP) everything about this tablet is going to be the same with the others: the display is a low-end TN panel with poor viewing angles, Windows' UI is not well-suited to the task, touch event processing is laggy, the device is bundled with additional applets (that really don't fit in with the system aesthetic or philosophy) that provide essential functionality not already provided in Windows, things like that.
This is the lowest 'end' format we'll see touch tablet PCs take, but because Windows 7 computers are all largely a race to the bottom it means it's unlikely anyone can be assured of a quality user experience (especially as the traditionally 'high end' manufacturers like Sony and even Dell are actively avoiding the desktop Windows slate tablet market entirely).
(Of course the real reason I'm having an iPad 2 arrive at my door within 3 weeks' time is because of the demands of one of my clients, and not because I need any old tablet and I'm too much of a snob for a Win7 slate).