Wow thats a lot! lol
Did you have any problems with yours when it was first set up?
No tbh i didn't you know, i actually missed of two extra things that are also connected.
The only thing i can say about it is , for a while at about 12.05am in the morning it would reboot itself, since then though I complained an was sent a new hub and its all been fine.
I do think the super hub has its flaws and theres lots of unhappy people who aren't to keen on it , but i think once you've got it all sorted with a bit of luck you'll be alright.
Also just to add, you say that the internet is slow when your upstairs and the xbox finds it hard to see it possibly because of a weak signal, I can use my super hub about 10 meters down my road with a decent signal, all my devices are in different parts of the house and each have the strongest signal possible.
I would definitely try changing the broadcast channel to start with an see what kind of difference it makes.