I wanted to try to get my K7 connected as a I do my K20 and as everyone knows, it can't be done with the K7. People in the forum suggested the Eye-fi expecting mixed results. I decided to bite the bullet and go for it.
Overall, its not a bad product...once you set it up.
I got the ProX2 so I can send RAWs over and do it ad-hoc (from cam to computer). It took me about 5 days to get everything working because one couldn't communicate with the other, DHCP timeouts, etc. But finally I was able to get it working by making my laptop a hotspot.
Connectify does a very good job of this (Warning! Only works in Win7) and I made the card see the ad hoc network pretty easily. Once it sees the card as a client (10-15 secs) it can dl the picture from the camera to my watched folder on the HD in about 7 seconds (10Mp), 10 secs (14mp) and 10-13 secs (14mp RAW DNG) and shows up in Lightroom. Using wireless G it seems the same speed as the USB tether. I want to try with N but I figure I have this working well, soooooo.
Ironically, its compatible with the K7 but not with the K20D. So, technically I replaced one shortcoming with another. Ugh, I'll have to laugh or Ill cry.