Got a call of them a couple of weeks back,they've changed there sign up deals a little since.
The first year is free then the second is £100(this may now have changed)
They price the jobs with out looking at them by offering discounts,then you clean them and pay them£10 a job.
May be good if your just starting out and have little work but no one established with plenty of work will ever sign up to this there taking the p.