That looks like a cool piece of kit, unfortunately I am not tech savy enough to tell you if its any good or not. My limited knowledge says it will likely do your job just fine, but I am inclined to think that if you approach a PC shop and explain exactly what you want to do they will provide a much cheaper solution. I myself will be looking into routers today with a view to connecting a second PC to my connection, although both computers will be in the same room so they will likely be hard wired. My thoughts are that that is a little expensive for the simple task of hooking 2 PC's into one internet connection.
Hopefully some of the tech experts on the board will have some input.