Has anybody used AirPcap

Whilst checking on "Kismet" builds I came across this:-

" Native capture is not possible via any other card or driver inside
Windows. These packages will ONLY WORK with Kismet remote drones and
Cace AirPcap devices."
http://www.kismetwireless.net/download.shtml

AirPcap
http://www.cacetech.com/products/airpcap.htm
http://www.cacetech.com/bin/airpcap_..._1_0_0_594.pdf

The price tag of $198 seemed a bit steep as they normally transfer as £1
to $1 when we get them in the UK. However it is being offered as part of
a bundle with Wi-Spy, ver1 I would guess, for "£225".
http://www.crownhill.co.uk/product.php?prod=1610

So has anyone used AirPcap and have they tried it with Kismet?