what you have got to remember is that your Rolls Royce is fully featured and far more customisable than the shub. Guest networks are great although I don't think you would have a lot of use for it but along with everything else, it si a feature you can disable. Don't be afraid to have a nosey around the router configuration, some stuff is self explanatory and there is a lot of other stuff you dont have a clue about; most of the settings though you can leave as default because it works as it is (in contrast to the shub) which is the beauty of it. You can click on the help button on every page and it will explain what each of the sections are for and what it all means.
If you want a hand with anything like setting up your wireless and stuff pm your phone number and I'll ring you tonight and talk you through it.
Btw, you cant rely on speedtests anymore. There is no way your router is throttling you. The best thing you can do is give it a blast on newsgroups if you use them or go to
www.gamershell.com and download 10 1gb+ files from a gigabit servers and add up your download speed just to prove you are getting the speed. My speed test always come back as bang on 50mbit but I have no probs downloading at 12mb/sec = 96mbit.