And so you should. 
The fibre should allow faster, cleaner speeds - it should not involve shaping of any sort. 
Of course it doesn't matter if its fibre, coax or wet string, with all ISPs the connections go back to a data centre somewhere. Oversell the ability of one data centre and you need more money. The alternative is to adjust the TCP traffic.
As I understand it VM have high infrastructure costs; but essentially once the data is at their data centre, they have the same usage problems per £1 that PlusNet and all the other cheap ISPs have.
James -
be* pro - on THFB - sync about 17.2mbps -
BQM