I have been with them for 4 weeks and they are superb. 1 month contracts, no set up fee, free microfilters ( 2 ) and the price has just come down.
The speed is one of the best around and no problems with connection.
The support line if used is answered very quickly and are helpful.
You will not regret using zen. Im so happy with them, im having a business line installed and will be using Zen for the bb connection.