Sounds awesome! I played with one for a few minutes at Best Buy. I was with other people so I didn't get to mess with it too much (no Marvel app for me to try), but I played a little Plants vs. Zombies and some Real Racing, and those were both very pretty and controlled well. Checked out iBooks and that was pretty damned slick, too. Didn't have a problem with much glare on the screen even standing under all those retail store lights, but I'll probably get a matte screen protector. Initial impressions were - yeah, it's a big iPod Touch, but its a big FAST iPod Touch with a great screen and which does a lot of cool shit tailored specifically for the device.
Shame about the HP Slate, cramming that Atom in there was probably a mistake. They should've bumped the RAM up to 2 GB, as well. Win7 will probably run fine on it (runs fine on my netbook), but once you fire up a processor-intensive program it's gonna start to chug and chew through the battery in a couple of hours.