Been with them nearly a year?
I honestly can't fault the overall service they provide? Connection on 24/7 (only ever had about 3 hours downtime and that was BT's fault?), the speeds have always been near enough 100% spot on, tech support good if you ring in the day: less that two minutes wait in my experience?
The downside: as already mentioned, they do port-throttle 24/7
Which in one of the reasons I'm leaving them as soon as I can
I download on average, 60-75Gb (Mainly torrents) a month and they've never complained, but the downloads seem to be capped at about 20Kb/s, unless your client supports encryption?
Also, they only do a 12 month contract as far as I know? And they're expensive!
Apart from that, great ISP
SW.