I have recently moved to AAISP from Virgin and have been nothing short of astounded by the quality of the customer service and support.
The support engineers (particularly Stuart and James, from memory) were very helpful all the way though the process including talking me through the different services and how they work, organising engineers visits, and providing a completely un-matchable after care and tech support service.
They used their extensive knowledge to explain complexities of service providing in a simple yet coherent manor, and to find the service that perfectly catered to my needs.
The service provided by AAISP is entirely worth the price.
Highly recommend.