On my 50D there was no speed due Ausfälle.Vom Pricewise a little cheaper than the Extreme IV.Dies is already my 3rd SanDisk card and I am very satisfied. There is something rather more money on quality ausgeben.Bei eB .. for little money a lot of SanDisk cards from China this kommen.zB here for under 40 .Aufpassen !!! there are all fakes. Prefer to order here at Amazon and you have nothing to worry about.