well i moved from BT and got the O2 Pro package for £17-ish
using the setup was an absolute doddle, took about 2 mins, using the supplied O2 Wireless Box III, this is for the most part is perfect for most people, is used to sync at 19200-ish near enough the full 20Mb
i however, use a Cisco, i seemed to sync at around 15500ish initially but it has been creaping back up, im currently at 17600ish, i think this is down to different chipsets on the modem and possibly O2's routers using different extensions to Cisco, therefore syncing far better (i could download at 1.9MB/s now i can only achieve 1.75MB/s
there is/has been problems on the O2 network, mainly down to loss of routing on WAN subnet (down to arp tables being flushed and not renewed - i think), some people experiance problems with DHCP, but i think this has been resolved plus it never affeceted me, last but not least, the DNS servers are a tad poor, ive set my Router to use openDNS, and its been lightning all the time
with the correct setup and knoledge O2 can be fantastic, although from what ive read the technical support seems to be better on Be
but for the price its damned good, plus there working through the problems
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