S1 roofs vary wildly. Mine was great, very little leakage even in a torrential downpour, and no worse than a 318 convertible my brother once owned. The odd drip in very heavey weather, but no big deal.
S2 is totally watertight, and the hood folds down relatively flat compared to some of the 'pram style' ones. Woudl be great to have the rear cowl flip up to drop the hood under, but it all adds weight to do..
