I have docking stations at home and work so I get multiple large screens and trackballs for my laptop, but yesterday I received the AOC USB powered monitor that's been available for a while. I actually ordered the $90 older model. It's big and bulky (although not very heavy at all) but I plan to take it with me on the occasions when I'm expecting to be working in a non typical place AND needing extra space. I don't think I'd want to lug this slide enjoy thing all over the place.
It may have a few specialized use cases, but in general you'd be better off if you have any way to get good quality display port monitors at your normal work places.