I love the Dell XPS 15, mine arrived yesterday.
I use it primarily as a desktop replacement. I keep it in a Kensington Laptop stand... http://reviews.cnet.com/docks-stands/kensington-laptop-desktop-usb/4505-19213_7-31078646.html I use it with a remote keyboard/mouse via a KVM switch.
I use the setting on the Kensington to stand it virtually straight up, so it is in line with my other 3 monitors. There in lies the issue for me. The Dell XPS screen does not tilt back much more than 90 degrees. My previous XPS that was replaced with this new XPS had the screen at the back of the chassis but the new XPS is set in toward the keyboard so I have to have the Kensington on the lowest setting and that means it is virtually sitting flat on the desktop taking up more precious desktop real-estate.
As a laptop, I am impressed... sight, sound and performance is more than I could have asked for. The ease of setting it up (so far) has been AMAZING! Out of the box to network to wireless in less than 15 minutes. I know Windows 7 Ultimate is confusing at 1st but as with anything I'll get used to it, then I'll want to change my desktop also, there is the cycle of life that computer manufacturers hope for.