Lora Heiny, a Microsoft employee let her daughter, Kim, use a prototype of the TabletKiosk V700 and I think it gives us a more realistic idea of what it's going to be like to use one of these first generation UMPCs.
It looks like something kids feel comfortable with, UMPCs are not something bulky yet fragile like a laptop. Although, I'm curious how the wear and tear will affect the UMPCs. When I spill my milkshake on my precious will it keep on ticking away a bit stickier but not much worse for the wear? At least they won't have the same issues that the Apple iPod Nano's were facing with their cracking and scratching.