I have been using this card in my Canon R5 and it has been very good for write speeds with no buffering that I have seen. Granted I don't take a whole lot of video or keep the shutter button pressed for long periods of time. When reading data off the card to my iPad Pro with a card reader and it is exceptionally fast getting off all the RAW images to Lightroom. It takes seconds now instead of minutes when I was using an SD card. Would highly recommend this card and have been using Sony Tough G Series for a long time with no issues.