Migrated from eclipse in early 2007 after getting frustrated with their lack of customer support. ICUK are a breath of fresh air when it comes to customer service, they worked hard to solve migration issues and when I had a problem setting up my email I called them on a Saturday to find the phone was answered by a real person within a few rings and they actually know what they are talking about.

ICUK are a no nonsense isp who give their customers what they want, not the cheapest around but in my opinion they offer real value for money and some of the other providers could learn a lot from them when it comes to customer service.