I've heard good and bad things about them, it seems their customer service/support is be very bad. Though it could be much improved now, I read some complainst some time back.
I think they have a one month contract option, if so its best to try them out. They do have good deals on their 4MB connection.
I'm with freedom2surf who are quite good, for £25/month you get 50GB transfer limit, which is plenty.