I have just set-up this device in 'mixed-mode' without suffering any problems in this thread.
As a rookie, here are a few things to consider:
1. First thing I did was a Firmware upgrade to very latest build
2. Wireless PCI card is a LinkSys 54G - no-ones said which card they're using at the other end !
3. 'Keep Alive' or 'Connect on Demand' Option under 'Basic Set-up':
"Connect on Demand: Max Idle Time. You can configure the Gateway to cut the Internet connection after it has been inactive for a specified period of time (Max Idle Time). If your Internet connection has been terminated due to inactivity, Connect on Demand enables the Gateway to automatically re-establish your connection as soon as you attempt to access the Internet again. If you wish to activate Connect on
Demand, click the radio button. In the Max Idle Time field, enter the number of minutes you want to have elapsed before your Internet connection terminates."
The general view is that the firmware on this device is OK - just be glad you didn't buy the older tri-band model. There's a company in Scandanavia that's hacked the gateway OS and fixed the bugs that LinkSys couldn't be bothered to do (
www.sveasoft.com). DON'T be tempted to install their stuff on your device (IMHO).
I'd suggest that you invest £35 in a LinkSys 54g card for your PC/laptop - try and buy it on a 'Sale or Return' basis having talked with Customer Service at the place you originally bought the gateway.