FWIW, I've had mixed results with buying cheap electronics and computer stuff on eBay from Asia that doesn't have a brand name. It could be a great deal, it could be a total rip off. As you probably know, ~$21 USD is a fraction of what newegg.com or Amazon.com charges for a 32gb Class 6 SDHC from a recognized manufacturer. It could be that what you're buying is exactly the same without the fancy label... or it could be that what you're buying is part of a batch that couldn't be sold because of quality control concerns.
My guess is that you might find that the read/write speed on most on the card is far slower than Class 6. However, I believe that someone said that the eDGe maxes out at or around Class 4 speeds, so it may not be noticeable.