I have converted to Silblade:
Re: which windshield wiper to get?
"SilBlade� has been formulated with a premium General
Electric silicone elastomer"

The Bosch blades on my 911 never lasted very long and
so I bought a pair of these Silblades.  I liked them
so much, I bought 4 more for my Vanagons.  They are
pricey, but the ones on my 911 have been there 2+ years
instead of 6-8 months for the Bosch.

                        Richard A Jones
                        Boulder, Colorado