Yeah, definitely cheaper but for travel, where EVERY ounce in my carry-on counts, I am thinking the plugbug has potential.
Absolutely, I got to speak at a conference in Brooklyn 2 weeks ago (2nd trip to NY, was awesome) and in my room I shared with a coworker we had something charging at every 5 different plugs because there was something else already plugged into each one (lamps, TV, etc). Thought for sure I'd left my iPad cord in the room because I had to plug it in at a strange spot, but found it in my bag later.
Most of us here at work were considering it for just normal use at home and work, doesn't make as much sense.
I'd love to put something like this in a handful of the sockets in my house. http://www.electronista.com/articles/11/06/23/charges.usb.powered.devices.without.an.adapter/
If I ever went that route, I'm much more likely to just go with that product in my last post though.