Try doing a search about on the net to find out whom the card is made by, there are an endless list of names/brands on these cards but there aren't really that many companies that make them. Some of the cheap cards about come out of the leading factories, some of the expensive big brand name cards come out of lower end factories lol.
Sandisk, Kingston, Ridata (ritek I think makes those) and Lexar are the most trusted brand names. I'm waiting on a no name cheapie card atm to test out, a little research and I find it's made by one of the worlds leading memory manufactours.