Hopefully be the time you come back to read this, you'll have a huge grin on your face!
If so, welcome to the *real* BB experience!
In my experience there are only three negative points with VM: billing (new system due in few months), support phone lines (well, almost all ISPs fail...) and speed restrictions during peak hours (but coming from ADSL I'm sure you're used to that!) -- read the
STM (Subscriber Traffic Managment) page.
If you do have a problem, it's worth search these forums for an answer and posting for help if nothing found before tackling VM's Tech Support. If you do find you need to contact TS, I'd recommend using
VM's newsgroups before considering phoning them on the premium-priced number!
Oh, and start reading about the Phorm privacy outrage that VM are apparently trying to stick us with. More at
www.badphorm.co.uk
Have fun!