I've used AAISP since 2002 and always had good service. That was with ADSL then VDSL. Sept 2023 Openreach finally installed FTTP and so I upgraded to a 160 Mbps service and switched my phone number to VOIP so I can get rid of the copper line rental charges. Everything went smoothly and I didn't even have to configure the FTTP router that AAISP sent me; it did it automatically. AAISP are not the cheapest but they are a technically competent niche provider with no stupid "if you want this press that" support services. You get through to a real human being straight away. It helps if you the customer know what you're talking about too.