I've used AAISP for our business ISP for some years. No one was as flexible or competent as them. But when it came to choosing a home service AAISP is more expensive. Frankly the extra cost is marginal and you get so much more. You can see where they spend their money, how much are you paying for those glossy leaflets that pour through your door from the likes of BT and Virgin for services that probably aren't available in your area and for 'deals' that last at most 6 months.
My only worry is that when a 'rare ' problem occurs the level of technical competence on the first line help desk is so good I feel slightly daunted!
Factually.
Quick, accurate, online response to request for service. Fixed IP address included. Clear pricing. Bundled internet only phone line [ie no triple play confusions or 'offers']
Superb online monitoring tool which gives both tech details [if you need it] and progress of install and router shipping etc. Quality router with clear indication of logon and password on removable card attached.
Speed limited only by ADSL capabilities of the line. No filtering or restrictions by content, port number, time of day.