I've been a happy A&A customer - first, purchase of ISDN equipment and an ISDN line and then continuously for more than 22 years up till now, ADSL, FTTC and finally bonded FTTC.
The A&A service has really been excellent throughout the whole time and I don't have a single bad word to say about them.
Unfortunately, I have to jump ship now to an Altnet which arrived here this week (I'm now getting about 935 Mbps up and down compared to 85 / 15 before). When A&A have something comparable in speed, I'll be back in a shot!
In the meantime, A&A's L2TP service will save me from the horrors of CGNAT with the new provider.