About this map much has already been written. There is also nothing more to say. She's just quick as lightning and enthusiastic. Fast cards make but in a camera only makes sense if you want long continuous shooting. Here there are 2 bottle necks. Once the card itself and the second - and that is often overlooked - the maximum write speed of the camera. And this, I want to give my short experience with the Canon EOS 600D next. I have the "Extreme Pro" (95 MB / s) and the "Extreme" tested (45MB / sec). There is in the camera definitely no advantage of this faster, more expensive card. With both types of cards you can record with JPEG continuous shooting in maximum speed until the battery is empty (I stopped after about 150 images in series). In RAW mode, the camera creates 6 pictures in maximum speed, then the buffer is full and we continue every second. This creates both the "Extreme" and the "Extreme Pro". The limiting factor here is therefore the camera off or the memory card.
Conclusion: the EOS 600D makes this card does not make sense. Here you can invest your money sensibly and with a clear conscience in another card or a larger capacity of 45 MB / s. 5 stars for the memory card, because of the slow Schreibgeschindigkeit the camera can nix.
I hope I could provide save one or the other EOS 600D owners a decision criterion for money.