I'm with them
I've had no faults with the service and when I've had to phone them to change the direct debit details it did make a nice change to be able to talk to someone who has the same first language as me (although Yorkshire is nearly as hard to understand at times :))
The only thing I will say is they do limit bandwidth to certain services at certain times of day, but most ISPs do this to some degree and plusnet are a lot more open about it than most others.
http://www.plus.net/s...download_speeds.shtml
They also offer an upgrade for an extra £5 a month that gives you maximum available speed on all services at all times (which I do pay for as It's worth it to me)
All that said, you will always get people saying good and bad things about every ISP, they are all OK if everything works and they can all be a nightmare if things don't work, to a certain degree it's luck of the draw.