i have bt broadband and its good.
the homehub is basically a wireless router.
Unlimited isnt unlimited but unless your a computer freak and download 24/7 you have nothing to worry about. i have option 2 and have 8 meg broadband.
it is really fast, i can have three computers a DS and my wii on mario strikers at the sam time and i get no lag at all.
it is good and reliable, also fast (depending on where you live)