Been with Zen for 12mths now on a 512k connection. They activated my line within 3 days of receiving my order. I have never had any cause to contact them and have never had a time when I could not connect or had a slow service.
If you take time to read the customer service survey on
www.adslguide.org.uk you will find that they consistently come top for both speed and support.
Keep up the good work Zen!
and no I don't work for them!