As for rollovers and safety, it's actually surprising.

Absence of roof is inherent disadvantage. High-speed crashes are violent events, and the roof of a hardtop helps to keep people's heads and arms from flailing outside the vehicle. Roofs also provide protection if a vehicle rolls over. Data from real-world crashes indicate that the overall risk of death isn't higher in a convertible, but this doesn't mean there aren't any safety disadvantages.

As for a regular crash however.

Restraints/dummy kinematics: Dummy movement was reasonably well controlled. The dummy's head hit the A-pillar, which bent downward and inward during the crash. This is one of the unfortunate drawbacks of convertibles. Without a permanent roof structure to support the A-Pillar, they often tend to move straight in at the heads of occupants

This is a little bit backwards from what I thought. I figured that flipping would cause more injury then a regular crash, but the above says otherwise.

http://www.themustangnews.com/carnew...-0607-iihs.htm