Well, I requested my MAC on Friday evening, and it arrived yesterday morning - rather speedy for an ISP who's being inundated with people wanting out and over a weekend/bank holiday as well - makes you wonder if the speculation that the price rises were a ploy to ditch a load of customers becuase they hadn't got the capacity for them was indeed correct.
Anyway, I decided to go with Zen in the end - got all my account and activation details and such like ready for my migration date of 8th Jan less than 12 hours after signing up (which was late yesterday afternoon) - pretty impressive.
