Cylinderist: absolutely - I have a vested intrest.
I do wonder though, if you were buying a luxo car (any luxo car) to have converted into a limo at great expense, surely you would splash out and opt for a larger engine model.
I suppose a conuter argument is that limos are about style not substance, and that you rarely use them to get somewhere fast. And in a way this car is proof of the 6's abilities.