Wait! There is a difference. The 'M' of M-80 stands for Modiophile, as in for modern audiophiles. This is a terrible, made-up marketing term which taints all that is good; only a modern fool would go by such nomenclature.
The 'V' of V-80 stands for vampires, and there is currently nothing hipper than to be associated with vampires. The Twilight films have been a great big hit among the Head-Fi community, and I am super glad Mr. Voltron decided to honor our love of teen vampire love.