I had an ADSL line with Zen for a short time and found the network to be exceptionally good. However, I am not sure why Zen's customer service is so highly rated as my experiences were that they can be a bit slow to reply to questions, and in my case they didn't spend the effort to answer my question about ADSL to FTTC upgrades (which another ISP was willing to investigate with Openreach, so got my business). Overall, very good in the important area of having a quality network - and IPV6 too!
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