Canon EOS 550D shooting: 19.3 MB / s
Nikon D5100 shooting: 28.3 MB / s
Nikon D3200 shooting: 41.5 MB / s
Card Reader: 90/75 MB / s (read / write)
All values are currently the best that the SD memory card market has to offer, but most comparable models cost significantly more money (per gigabyte). In addition, Lexar is one of the handful of vendors produce high-quality memory cards. But in order to achieve the high performance (read the card reader or writing in the camera) requires devices with UHS-I support. Only a few DSLR cameras supporting this standard, such as the Nikon D3200, D5100 and D7000.
On cameras without UHS-I support the Lexar 600x is not faster than others, quality Class 10 cards and offers - a good USB 3.0 card reader with support UHS provided - "only" when copying the data on the PC an advantage.
Anyone looking for a fast memory card for continuous shooting in their own DSLR or system camera and want to transfer the data to the PC masses quickly calmed can strike when play because the other components. Otherwise it can be done cheaper.