Having spent more than two years with ICUK's 8MB Home product I am overall more than happy with their service. There's only been one outage in that time and that was sorted within a couple of hours.
Download speeds were excellent whatever the time of day and pings were invariably excellent too. I Found myself connecting with a 7MB profile instead of a 3MB that I used to with my previous ISP (ADSL24).
But now I am leaving, I am leaving because recently they've become almost unusable some days. When ICUK are having a bad day, which seems more and more frequent lately, they're really bad. You can forget about watching iPlayer or even waiting for a Gmail to load. But they assure me this will all be fixed when they migrate to their new network. But that's not soon enough for me!
Good luck ICUK :)
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