Very well written review. Covered all the bases for the few dozen souls who will ante up the moolah for this thing each year.
As C/D noted a year or two ago, this newish 6-series convertible is fundamentally lacking in structural rigidity, and the reference here to the windshield fluttering like a Fox body Mustang convertible's confirms their diagnosis. Dagnab it, even when you splash out $150K with tax, you cannot get it all. These are the kinds of daily trials and tribulations faced by the the wealthy that we, the mere peons who grease the skids of commerce can only guess at. Even life at the top of the food chain is badly buffeted by mere manhole covers, and a potholed road becomes sheer misery.
Too darn bad! To those serfs who see this swish by as they plod through their daily lives coddled by mere Camry suspension into believing the road surface is smooth, the BMW's secret lack of structural engineering will remain known only to a few privileged souls, and they aren't talking. Rather like discovering the rock hard back seat in a 428i, few will ever HAVE to find out the truth - that wooden park bench engineering is alive and well in Bavaria.