I got mine, tried it out. Works fine. Not an uber-quality controller, but does the job very well. I got it on a whim, to play some retro games - and it does the job well - without wires :)
gonna have to consider getting one of these then
Mine was also brand new, boxed, and sealed.
If it is a refurb, they have done a bloody good job - there is no mention on the website about it being a refurb either. I suspect it is just stock the manufacturer is trying to get rid of, as quite frankly gamecube controllers aren't in high demand. All I was looking for was a cheap wired Gamecube controller so my kids could enjoy some retro gaming - but found this instead (and I hate wires) - so a bit of a win-win.
http://www.google.co.uk/search?hl=en&client=firefox-a&hs=klz&rlz=1R1GGLL_en-GBGB373GB373&q=DREAMGEAR+WIRELESS+CONTROLLER+GAMECUBE&meta=&aq=f&aqi=&aql=&oq=&gs_rfai= This search shows as refurbished from them for £4.99.