My one outing in the back of a cabrio made me cringe. It was a "cal-look" Mk 1 Beetle finished in fetching grey primer, the back seat was the size of a postage stamp, and well it was pants. Even though I was a stewdent at the time, I worried about my credibility and reputation.
Being in the back of an open Series 2 Landrover was different though - that's not a real cabrio is it... in fact it's probably the only exception to the rule that roofless is crap.