According to Andyschism's tests over in Arundel Mills, he's had better luck with the USB adapters than the PCMCIA ExpressCards. Apparently the ExpressCards don't support an external antenna (RNA) adapter and the onboard antenna isn't as good as the USB adapter's antenna. Until a better ExpressCard is released, I'm recommending the USB adapter for own purchases here (currently 9 USB adapters in use).