Wow, this is fast. I shot a bike race yesterday and this was just great. Filed the almost the entire card and never a hiccup. A lot of rapid shooting (3fps) and there was never a slow down in writing to the card, even in RAW. The download to the computer was much faster than anything I've used in the past. Just a few minutes to download 2GB!I've been using this for about a month now and couldn't be happier. Not a single hiccup, burp or fart. Be aware that there is no arrow showing which side is the top, unlike most CF cards. So, if it's not going in, don't force it cuz it's likely upside down.A newly formatted card holds 200 RAW images on my Rebel XTi and 442 hi-res JPEGs. Make sure you get a fast card reader--it will make a big difference.