Actually I encounter a problem with the forward hard top (not the big one, the other over the driver's head).
The locking system have somehow weakened with use and the top partially left while I was driving on highway. It's a little frightning but I managed to maintain it with a hand while driving with the other one! I suppose something like that can cause an accident, so just check for correct closure of the lock.
Since then, I've replaced the top (by a transparent one, quite stylish actually
) and the locking system. And, just to be sure, I secure it with a couple of nylon tie-wraps during winter.
About the forward top, no problem whatsoever. It just have a tendency to leak during big showers but I think its because of the rubber seal who begin to crack along the rear door.