I'm not worried about maneuverability for general-purpose use. It's tricky business to boost into a mail slot when your deceleration and turning prevents you from aborting due to a mistake, though. I'm debating whether to just fit a Cobra for Shadow Delivery missions, since it's much harder to screw up horribly (not to mention the extra speed). I like the Asp's carrying capacity, but I don't realistically ever approach my maximum cargo capacity, since I don't stack upwards of 20+ SD missions. ~8 is the most I'm willing to stack.
Problem with python / cobra / clipper is their jump range. ASP is not perfect but its jump range makes life a lot easier, especially for the way back.
But also, when you have stack 10+ missions, it is better to do onl 10 jumps to your destination instead of 18 for instance....