First off don’t expect anyone to reply to your emails or messages, beyond that if you telephone you get through to someone (20mins wait for tech support as April 2021) who is very knowledgeable, helpful and polite.
The Zen supplied Fritz! Router is probably a single very good reason alone for using Zen, this bit of kit does everything, work 100% and reliable.
I migrated to Zen from BT, saving £15 a month for same service, have slightly better ping times, a DNS server that works and a router which allows you to change all the settings.
Time With Provider: 1 Months
Package Name: Full Fibre 100