How the hell is this portable? Even if I can move it from one place to another, I doubt I'd be able to use it comfortably without setting it on a surface first. This is a stupid idea because it takes all the portability out. Its just a touchscreen PC.
People have different standards of portability. This is about an inch larger than your standard 17.3" laptop (but much thinner by the looks of it). The thing is, many people wouldn't consider a 17.3" laptop "portable" either, but in my eyes there are two types of "portable" in terms of practicality:
1) Portable enough to take to the toilet. If it's portable enough for this, it'll be portable enough for pretty much anything else. Smartphones, along with tablets/e-readers about the size of the iPad generally fall into this category. Some smaller netbooks/ultrabooks may also fit this category, ymmv.
2) Portable enough to take with you wherever, so long as there is a table or desk at hand.
Most standard laptops fall into this category, as does this XPS 18. I don't know about most people, but I can't stand working with something on my lap for extended periods of time. It's simply terrible on my neck. Putting something on a desk is just more natural and comfortable, and it's what I prefer doing whenever possible. So if you can carry around a 17.3" laptop, the Dell XPS 18 should be no problem. Plus I hate squinting at tiny screens.
If the XPS 18 also came with a pressure sensitive stylus like the Surface Pro, I imagine digital artists would be all over this. The Surface Pro already is an excellent alternative to say, a Wacom Cintiq, which generally costs the same or much more depending on the model, and they don't even double as a full PC like the Surface does.
(Here's a review of the Surface Pro as a digital art tablet: http://goo.gl/YSsm5)