Yeah kinda depends on what you want in a car. I personally would not be caught dead in one of those.
Top speed is kinda irrelevant with a car like that. People are buying the promise of performance, not the actual performance. The people who really care about going fast ( with this kind of money ) buy Porsches and Ferraris, and take them to the race track. M6s on the race track are going to be relatively rare.