29% isn't much, and you have to remember that this is a first generation Windows tablet. If you read the Samsung Slate reviews, you will find many reviewers being very excited about the product and the new possibilities it brings. It's a real Windows computer, and not just a media consumption device. You can connect it with a USB cable to your printer, scanner and camera (among other things). You can connect it to a Windows network just like any other workstation (network printing, accessing files of your company file servers, shared user credentials, distributed computing, etc). It can connect to all the same services and run all the same software any Windows based laptop/desktop can (even your own custom made software/services). It can run full versions of latest Word, Powerpoint, Excel, Outlook and Photoshop. If you are traveling a lot and need to do some work on the go, this tablet is perfect for it. On your hotel room you can put it on a dock and use it with a wireless mouse + keyboard and have a desktop computer on go (much more ergonomic than using a small notebook). And when you are outside your hotel room, you can carry it with you like any other tablet.Extra size + extra weight = less mobile, unfortunately. We've tested a bunch of tablets in my (still) recent job and IMO if this is the direction of Windows-based tablets, than it is bogus. :S
The 1024 level Wacom digitizer makes it really appealing to graphics artists. Wacom Cintiq displays cost around 2000$ (just the display without a computer). A personal Wacom tablet + computer on a go with half the price tag is very appealing to many.
I must agree that the device is more appealing to business and professional users. iPad might be a better choice, if you just consume media (browse net, play casual games, watch youtube), but if the additional features and possibilities are important for you, this is really a unique product, that has unique value compared to any tablets based on mobile technologies. There's still a lot of time to Windows 8 launch. I am sure we will see similar devices (and an improved version from the Samsung device) at Windows 8 launch.