In reply to laurenmcginley:
Not sure how the answers are going to be helpful to you without knowing how many km a month the shoes will be used for. Some runners would wear a pair out in 3 months, others only after 2 years or more. So if I belong to the first group, £20 a month is definitely worth it; if I'm only running once or twice a week, then definitely not.
Also: which sane person would choose £20 a month for one pair over 10£ a month for 2 pairs?
Post edited at 16:47