If I was to summarise, I would say simply Andrews & Arnold, just works - no marketing buzz words, what they say, is exactly what you get.

Broadband: The broadband is second to none, when it comes consumer (or even some business packages), for context I came from Virgin Media Business package; and AA excels in every category.

On the technical side, AA obviously invests a lot into there core network, not only is latency superb, but peer-to-peer communications with third party networks has higher link capacity (for example, to my own network located within a datacenter, throughput increased by 2x) - with same underlying advertised link capacity. (and not to mention, true routed IP space, IPv6 support, SWIPing, reverse DNS, BGP peering - honestly, if you like network engineering, this is a dream!)

Customer Support: Instantly able to talk to a human, no AI, no robots, just knowledgeable humans who do not read from a script.

Further, AA go a step further, again you can see they truly care about the customer, and will do anything within there power to ensure the customer has a good experience, even as far to point out issues with the line, then ensure OpenReach fix.

In addition, if you're a technical person like myself you can instantly speak to an engineer about any complex issues, or even requirements; honestly the service here is better than some tier 1 providers I have dealt with commercially, and given the price - honestly it's amazing.

TL,DR - what are you waiting for.