We can confirm that over the last week, we tested all the modes of the device and they work well. 3G also didn't cause a problem, however we obviously had to ensure there was an active data plan on the device before plugging it directly into the Asus Router.
We tested the device in a variety of real world situations with several Windows 7 laptops. We moved between rooms in the house to monitor signal strength and subsequent speed changes.
Our performance results were achieved with a handful of Windows 7 powered machines, using G and N modes.