For the holidays (Dubai and Maldives) I have two of these memory cards increased by on videos with the Canon Legria HF R406 camcorder take. The result was three hours of footage in the maximum quality (about 53GB). The R406 is filming in Full HD at 50 frames per second and requires a fleet card. This card is fast enough and has had no problems with the recordings. I have no measurements carried out, but I would describe the speed subjectively very fast. Ideal for use with modern FullHD camcorders. I would buy the memory card at any time!