They were looking for a solution, the images slightly larger than the camera's internal "flipbook" watching while shooting. Once the Canon's proprietary solution is somewhat expensive, the Eye-Fi card out of the question. Lt. the web pages is the card is not in the 1DX, with the appropriate adapter, however, then already. On its own menu entry such as the EOS 5D III but you have to do without, as the card but works via "plug-and-play" but one does not need to. One shortcoming is the range, the pad must be next to the camera, just walk around and take pictures and a second looks at the images in the background - is unfortunately not. The transmission speed is very high in JPEG in M2, probably goes even in L. The second shortcoming of the board is the power consumption, the transmission switches itself off although if anything needs to be transferred, usually keeps the battery at the 1DX with me about 1500 images through, with the card there were still about 600-700.