Both programs do the same thing - just using the 6800 as a Proxy and passing the TCP traffic over to your computer.

I thought that the USBmodem was a very easy setup and costs quite a bit less. Plus it is already fully compatible with the phone.

For me - the biggest reason on going with this program was that on the Mac side, it supports BT and USB tethering. With PDAnet, it only supports BT.

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Powerflex chargers and Portaflex Sync/Charge cables
www.macmedia.com