The write to the SD card using this adapter using a Canon 5DMK II works well and recorded no losses. I was both the speed check with the PC as well as the test with the continuous shooting function of the camera fesstellen no difference between the pure SD card, SD card adapter and a CF card with the same speed as the South Card namely 32MB / s.
In the continuous shooting function 18 images were available for all version before the first time had to be buffered. The recording videos even presented as a problem. I tested this by simply times the complete memory map was long record a video camera, so for several hours and this also posed no problem.
Therefore, one can say 5 stars ud complete satisfaction. This adapter does exactly what it should.
The only thing you should consider is that the adapter slightly thicker so my previous CF tickets, but easily fits into the 5DMKII
