My personal experience with ZEN has been fantastic
I was with Plusnet on FFTC and had been for 4 years however in the last 12 months I was getting throughput issues where my sync speed was 70mbs but my throughput was lucky to be 5mb after 6pm at night. This went round and round with customer service and tech support for the 12 months. New routers, BT visits, line tests etc but the issue was never fixed. I was going through the motions of early contract termination as i was that fed up with plusnet when i saw Openreach installing Fibre on my road so delayed the switch until his was live
I switched to Zen FTTP and dumped Plusnet as soon as i could and never looked back. I originally could only order 300mbs FTTP however 6 weeks later i could upgrade to 900mbs
I have had absolutely no issues with Zen FTTP and its been a breath of fresh air compared to Plusnet's FTTC. They might be more expensive than some providers at present but their Price for life makes up for that in my opinion as the number of providers where contracts can raise with RPI etc during contract term is rising
Pings to online gaming are low 9-14ms and throughput has yet to drop below 880mbs and its tested randomly and often. Upload is 110 on test which has been greated when backing up to crashplan etc
In the last 6 months i have had 15 mins of downtime and this was at 1:00am where the ONT showed red lights and likey outside of Zens Control (City Fibre were installing and playing with cabinets all the same week on the estate so i put it down to cabinet/exchnage maintenance)
See Ya
Andy 'Mush' Smith