"West Coast Drive" or WCD, is a six (or occasionally eight) wheel design with cantilevered wheels (i.e, unsupported on one end), named for the teams on the west coast who have refined it and used it particularly effectively. 254, 968, and 330 come to mind first. For pictures, look here on CD-Media.
For video, try the Blue Alliance:
http://www.thebluealliance.net/tbatv/team/254/2007
That said, I don't think you'll know whether it was "worth it" just from a match video of another team. Team 254, for example, is very good - but that has relatively little to do with the fact that they use a cantilevered 6 wheel drive system. It has a lot more to do with their entire design process, the quality of their build, and the driving practice that they do.