I have tried the AOL unmetered package and I am not very impressed! Difficult to log on to network and the software 'takes over'. Also poor connection speeds.
Funny thing is that since trying BT for the past 2 months I have not had a problem at all. Fast, reliable and good value.
I think you will find many conflicting stories. Find one that works for you and stick with it.
One last point though, get a hotmail address then you can changes isp's any time you like with no real agro!
Cheers
JWF