Any convertible that still uses a plastic rear window is not worthy by today's standards. Plastic rear window is terrible...hard to see out of, flaps in the wind at high speeds, and just looks crappy!
I completely agree with codex, I really love convertibles and I would love to own one in the future, but not with a poopy plastic rear window !!
Actually, I really like the concept of the hard-top convertible (SLK, SC430, SL). It offers the fun of a convertible while providing the look and all-weather drivability of a coupe.