Just not my cup of tea personally. I just dont see that it covers any of the bases fully enough to be worth the money of the all out power.
OK – it'll be fast, certainly in a straight line, but hit a corner, and no matter how good the suspension/steering, you will feel its weight. You'll always notice it and wonder about what if the lighter handling of a sports car would have been better.
The flip side is that when you're not booting it, and you're cruising along, bikes in the back using the practical side of it, it'll have a hefty fuel bill and drink.
I have a 4.4 V8 Range Rover. OK – its not Cayenne in terms of power, but its no slouch off the line with the foot to the floor. I didn't see the need of a bigger power output ( and even more thirstier ), when its already something that I can push along quickly. Cause its a stock engine ( no chargers or turbos ), I've got it LPG'ed as well, which helps too. On a run, i'll be up at equivalent running costs of 30+mpg.
I now think that if I want the speed/handling, I'd definitely go the 2 seater sports car route.