my vinyl/sticker/tint guy says you have to be very careful with ebay stuff. Lamin-X is the best film to be used, but most of the time, they (the ebay people) supply you with lower quality products.
I used the ebay stuff to tint my fogs yellow and they came out nice but after about 6-9 months the film started to brown from the heat. I just removed the fogs from my car and stripped the film off. I'm looking into Lamin-X now. From what i hear it's the best stuff.