Thanks for the rain advice, which is pretty much what I have upheld for different reasons.
I have a 575 SuperAmerica which as you may be aware is susceptible to delamination of the electrochromic glass roof, but I have been firmly of the opinion that this is caused when the roof is locked closed, by the torsion of the car body and windscreen, given it started life as a coupe and had a lot of its strength cut away with the roof.
So....to avoid the potential delamination effects of the roof twisting with the torsion of the body, I (generally) only drive it with the top open so there is no strain on the glass. This philosophy has served me well and the roof is in perfect condition.
However, that weekend of the 70th anniversary, I had to bite the bullet and drive very carefully, avoiding bumps, with the roof closed and the sports settings de-selected for a smooth ride.
I must say however, my wife still had to keep mopping the water seeping in at the back top of the passenger window which was a less than perfect fit!!
575 Superamerica Rosso Corsa/Nero F1 HGTC RHD #145108