Others say...

"Works with Sony Alpha 300 with a microSD + SD Adapter"
It works beautifully with a Kingston microSD card + microsd<->SD adapter.
So now basically I just leave the compactflash adapter (with the microSD<->SD adapter nestled inside) inside the camera permanently. And I just need to carry a load of thumbnail sized microSD cards.
Love it. Didn't buy this item from Amazon though.

"Works great with a Canon 5D, but is a bit slow."
Bought it together with a 16GB AData. Made sure to format card in card reader, not in the camera. Works flawlessly. Is a bit slow:

For 4 shots taken with a Canon 5D in RAW+Large_JPEG.

SANDISK EXTREME IV 4GB - 9 Seconds
SANDISK EXTREME II 2GB - 12 Seconds
ADATA 16GB - 14 Seconds
Adapter + ADATA 16GB SD - 18 Seconds

Note that in my card readed, the Sandisk IV and the AData SD are tied for write speed at ca. 10MB/sec. So, it is most likely the adapter slowing it down. In the adapter, on the computer, the AData writes at 3.9MB/sec, which coincides with the time taken by the 5D, as 4 photographs at 20MB a piece ~= 80MB. At 4MB/sec, that is ~20seconds, which is the observed time to record 4 shots on the 5D.

So, in summary, good for travel (Better to have a slightly slower card that my Laptop and PDA can read w/out any external accessories, than to have a faster card).

Basically, for the money, the adapter is great, UNLESS you do weddings or sports professionally, and routinely max out the buffer on your camera, then it is not for you.

"Canon 20D & Eye-Fi"
I purchased this product along with the Eye-Fi home. Followed all of the instructions for the Eye-Fi, had to change my wireless network security option to get the card on the network & registered (used WPA-PSK, TPIK). The Eye-Fi fit well into the adapter and similarly the adapter with Eye-Fi fit well into my 20D. Turned on the camera and a CF error appeared.

A link to a site Photojojo Blog recommended to reformat the card, so I did. Everything works well, camera takes photos and shortly after the Eye-Fi transfers the image(s) to a folder on my computer all wirelessly. Note that you will need a wireless network, will not work Eye-Fi to Computer directly (ad-hoc mode). Small price to pay but it sure beats the bulkier wireless Canon option for about $1000.00.

Only thing missing is a Slide Show software that while running will display images from a folder that is being loaded wirelessly from Eye-Fi. Looking at Able Photo Slide Show V2.3 for that.


"EyeFi card + Canon XTI = Fail"
This product DOES NOT WORK with an Eye-Fi wireless SD card. My Canon Rebel XTI gives a CF Card error and refuses to take pictures when using it.

"Mixed results"
I purchased this product from an eBay seller in Hong Kong, and tested it with a 4GB Kingston SDHC class 4 card. Although I could format, read and write to the card with my Canon Rebel XT (firmware version 1.0.4) and EOS 40D (firmware version 1.0.8), I could only read and not write when I popped the adapter+card into my NEXTO-CF ND-2500 portable storage device (firmware version 1.38), and could not even read from the combination with my Lexar Firewire CF reader (model FWD11 Rev. C).