Having signed up with AAISP 12 months ago, I've been left wondering why I used to think "cheapest is best" until I signed up with A&A.
If you are just a consumer, and don't care about any of the tech - then A&A is overkill.

If you are technically minded, or want to do anything slightly above the bare minimum - A&A are second to none.

I initially selected A&A as they allowed me to continue to use my own kit, while still supporting VoIP. (Unlike BT - "use BT kit or lose your number when PSTN is switched off at your exchange" lock in hell). I didn't lose my number :-) Since day 1, I've realised just how good their additional services and knowledge are.

If you want static IP (both IPV4/IPV6), additional address blocks, VoIP (ported-in my old BT number), knowledgeable support team, "it just bloody works" type of service - then I highly recommend AAISP/A&A.