I don't understand the need for retractable hardtops.

-Modern convertibles rarely leak
-Convertible is lighter, cheaper,and doesn't take up your trunk space when down.

So why does anyone need a retractable hardtop? Is it safer? I can't imagine it is that much safer than a convertible with some roll-hoops.

Used toown a Z3 once upon a time, and never had a problem with heating either. Quite the contrary. All that engine heat blowing into a small passenger compartment warmed you up quite quickly.

It's a lot harder for a thief (or just an a-hole kid being a punk) to slash a hard top than a soft top.

Maybe, but I'll just opt to keep my valuables in the trunk...and the extra premium for the retracto-hardtop in the bank!:D

Oh. yeah one other thing: Added weight. I always wondered about the Mercedes SLK. This is a car which at least has some sporting pretentions...but they weigh it down with this retracto-hardtop. Can't imagine that it adds any kind of stiffness to the chassis. Might actaully SUBTRACT stiffness, because you have a non-cohesive weight at the top of the car which is inclined to sway.