Been with Sky on their unlimited (LLU) package for a couple of months. It has been absolutely brilliant. Great speeds, no slowdowns, even at peak times and truly unlimited.

The only negative thing I can say is that their customer service can be a bit hit and miss. Sometimes you get a customer service agent that knows what they're talking about, but sometimes you get someone who is a bit clueless. On top of this their customer service number is an 0844 one, which can cost quite a bit on a long call.

Overall though I'm very happy.