Once setup, there is a hiccough with the MAC address not being displayed anywhere until you attempt to access your router, this is faultless in use. Works with XP and W7. My pictures are sent to my photobucket account and to my home server, only drawback is you have to keep your camera on during transmission, this will necessitate you disabling the auto-off feature on your camera. The Eye-Fi manager software shows a popup pic on your computer of every pic as soon as it is uploaded, my server is also my HTPC so I can watch the progress while watching TV/Movies, brilliant.

...For the hot chick next door. :)