Zen is technically without fault. It's reliable and fast.

Zen's support staff is exceptionnal. I needed to call Zen only when I got connected to get help regarding the configuration of something (router or email, I can't remember; it was 4 months ago). The people I talk to were not the usual front-liners who bombard you with questions but who have no idea what they are talking about. The person I talked to was technically knowledgeable, which made the conversation pleasant (I am technically knowledgeable too) and also very short. Great support? No. It's exceptionnal support from top notch people!

But Zen has 2 drawbacks:
- It's expensive at £25/month for 25Gb.
- I find myself having to monitor my consumption, a chore I did not have to do when I was with an unmeterred service. I check it every morning to make sure my trend of consumption is in-line with the cap at the end of the month.

I am connected to the Internet without disruptions, but the price and cap still make make my connection a concern.

I would not think of trying another ISP (only with monthly contracts) if Zen would either lower its price or raise its cap.