The upgrader works really well, though use of the client-side configuration software is not recommended. You're much better connecting to the unit's web browser and accessing the full configuration. The good advice I got form their (excellent) support is "You will need to plug the unit either into your network or directly into your computer and then setup a static IP address of 192.168.10.10, subnet of 255.255.255.0 on your PC. You should then be able to access the AP using 192.168.10.100 in your browser."
I'm seeing only 150M instead of 300M, presumably due to some config or client wifi tranceiver limitation.