I have been with AOL for nearly 3 years now with NO problems whatsoever!
I was originally on dial-up and have recently upgraded to AOL Platinum, and I am reluctant to change as the old saying springs to mind "If it ain't broke don't fix it" and it would be the same for other ISP's as well.
I chose AOL as when I first had a PC 3 years ago the whole package was very convenient for me as it came with additional tools like 'Computer check-up' for troubleshooting your connection.
Also their helpline is FREE unlike *some* ISP's where you either pay a local telephone call or 50p a minute!
I am *not* saying everyone should jump on the bandwagon but *until* I have major problems I am staying with AOL.