Pros: Works fine in my Gateway laptop and my IBM laptop at work. Reads my 2 gig SD camera card no problem. Have not tried with the adapter and my Mini SD card from my phone. Nice not to have any USB cords!
Summary: With laptops you end up running a separate USB hub and power brick which sucks when you travel. This out of the way PCMCIA reader is a Godsend - no peripheral, no cables, no power brick. Life is good.
Pros: No need to give up or swap a USB port. My wife's Toshiba laptop only has 2 USB ports - this makes use of her PCMCIA slot which never gets used. And no need to carry around a USB card reader either!