(I should probably add that AAISP aren't alone on my shortlist- Goscomb Technologies are in the running, and Zen will be if they implement IPv6 before I have to make a decision!)
Hi Bill - I may be too late in following-up, but I moved from A&A to Goscomb in November last year as a result of the A&A price increases, increasing difficulty of controlling daytime usage ( running my own server ) and some niggles around customer support.
I was anxious about Goscomb because they are mainly a business connectivity provider but their customer service has been exemplary and they have been very professional in investigating any queries, even rather technical ones; they do read what I write and answer appropriately. Highly recommended.
Yes, native IPv6 works right out of the gate. They didn't have a v6 white-listing agreement with Google but as of June this year that's no longer a problem, all Google v6-hosted services such as YouTube are open to all v6 users.
And from the packets reaching my router it is apparent that they also support IPv4 multicast if you fancy playing with that!
Downside: they are rather pricey, particularly for the unmetered packages. And since their MD doesn't write a public blog it's not very clear what their plans and aspirations are, but on the other hand that also means I'm not exasperated quite as often...
Goscomb ( BE Wholesale ), Exchange NINTS