yeah me the same - i wasnt getting 16meg - i was infact getting 8.3meg (according to their test) so they just changed my billing rate to �7.50 a month.
sometimes with the wireless, for a couple of mins when u first connect the service is really slow for some reason but after that it's fine.
I just had to cancel (just inside the 100 day cancellation period) as i'm moving to a new house where there already is broadband
definalty recommend tho overall
the freephone help number is 2020 from your o2 mobile by the way