Everything went very well.
Got my confirmation text the day of connection and was connected, up and running within a few minutes.
The CD packaging says it's so easy the CD will do almost all of it for you .... not quite but for me it was easy to set up ..... not so easy for a 1st timer but the O2 help files were easy to follow.
The McAfee Security Centre was also soon set up and the 'small' problem I did have, with the help of their online "Virtual Technician" soon sorted it.
The only problem left is my son's laptop will not connect via wireless, but that's a PC problem not O2.
If you are going to change ISP then I can personally recommend O2 :-)