I have the Red Octane made wireless one I picked up at wal-mart. I havent used the wired one, prior to getting guitar I was using the regular ps2 controller bu for the life of me couldnt find a wired Guitar in my area that didnt come with the game. I alread had the game and didnt really need 2 and since the wireless one was $10 less the the wired with the game and couldnt find the wireless one on its own without having it shipped and waiting for it and I said screw it.
With that said my thoughts on the guitar itself are great, never had a problem with it since owning it (over a month now for sure), played the piss out of it hard, never had a loss of signal that I could tell, and has a decent range. All in all I would recommend the one made by the makers of the game, even came with batteries in the box, and should for what I paid
Just head to wally world and tonight and over the weekend can be playing with it and not wait for it to be shipped to you, and besides whats your time worth? Im sure it has to be worth more then the $10 your saving and the quality difference that may be found between the ebay one and the real deal
OH and may want to call your wal-mart(s) ahead of time. It still a pretty hot item and only one out of 3 stores near me had the one with the game and the wireless one and only had one of each left.