The annoying thing about the PlugBot is that the "creator" is trying to get patents put on the device - as if putting Metasploit on a PlugPC is anything unique (been doing this since they came out). See "© 2010. Patent pending." at the footer of the about page.

From talking to others in the local security/hacking scene (the PlugBot creator and myself live in the same area) nobody seems to be impressed with what he wants to do with it. PwnieExpress is a much better alternative. But, in reality - if you're planning on using these there's no reason why you wouldn't just buy and build yourself.