I have been with ADSL24 for one month now, and i just want to say how impressed i am with the service they offer. I moved from Virgin ADSL due to the ridiculous FUP, rubbish support, and crappy speeds. ADSL24 have in the space of a month restored my faith in BB.
They are upfront with usage policy, i pay for 30GB peak, 300GB off-peak and upto 8Mbps. Anything over the limit and they won't cap you, instead you pay for what extra you use at £1 per GB. Speeds are consistent; i get ~7Mbps throughout the day/night.
In comparison with Virgin i got < 5Gb / Month usage before they throttled me back to below dial up speeds, and even when not throttled i barely got 1Mbps. (On the very same line)
I'm only paying £2 more per month. Just goes to show there are still some 'legit' ISP's offering a good 'upfront' and 'fair' service.
Furthermore ADSL24 have a fantastic control panel webpage, which reports exactly how much you have used per/day, and allows you to make changes (like Interleaving, Change Plan, Add Usage, Request MAC etc..).
All in all i'm very impressed and would recomend them to anyone looking to change ISP.