Had only a few concerns that the adapter may not be as fast or possibly problems with the Cam (Canon EOS 40D) makes. Have him buy me because the CF cards are too expensive (Student). Have him along with a Samsung SDHC 16GB in use and it works perfectly, SD card inside and put it in the camera ... and running. One should only be careful that this CF card is a Type II. Hab weekend now the SD card test, 2 times made fully (with the Cam) and then tested all times no problems. Only in Sport mode it is a bit slower than the real CF