The VMO/MMO on the A320 is 350/0.82, For those who don't fly the minibus, the problem is that during cruise with A/THR engaged it will tend to oscillate around the managed mach target by as much as 0.015M. Cruising at 0.80, this will take you frighteningly close to setting off the big scary red light and it makes your day far more stressful. Plus it will fly 10 knots above Vapp on the approach if you've used the speedbrakes!
[ 02 August 2001: Message edited by: Carnage Matey! ]