I would agree with timmcat. It works fine for me. But I couldn't say what would happen if you used it 12 hrs a day, as I don't do that. There's also a second number, which is useful sometimes.
Avoid AOL. I used it for a while, then realised how bad it was. The only advantage I can see if that you don't get disconnected after 2 hrs. Try
http://www.ispreview.co.uk/ The forum is quite good, as you can see people comments on each ISP.