Although I dont have infinity I did have a problem with bt and these limited downloads, suddenly I started using more tham my allowance even though I thought I was unlimited, they started charging for going over the allowace each month but didnt warn me. When I complained I found out they had been sending emails to my incorrectly spelt email address, the upshpt was that I complained to the cheif execs office and got my money back and then cancelled and am changing to a new provider that is cheaper and has no download limit. As for the speeds they vary on my line immensly with bt, lets hope the new provider is more stable!