It does look like a neat installation, but the largest I could find was a 40 amp input, and that's rather pricy. I think I did about the same thing with a big 200 amp double throw transfer switch, 3 positions,, up feeds from utility, center is everything off and bottom is feeds from generator input only. I paid about $200 for the switch and had an electrician friend install for me for a very reasonable price. THe utility company sent a truck out to disconnect from utility so he could wire it in and came back quickly to reconnect me when he saw how it was being done to ensure their safety when I was using the generator.
It looks like the differences in useage, is with the double throw switch is that you manually have to position the switch and with the generlink you just plug it in and it looks like internal electronics makes the transfer. For long term reliability, I think I prefer my manual switch. What happens if you get a nearby lightning strike to the generlink.