For me, the end result of trying all 3 - OE Porsche, Bosch and Halfords - was a resounding and surprising success for....
Halfords own.
Th eBosch ones were worst by far - squeeked on the leftward stroke, fatter than the originals, didn't follow the curve at the side of the screen, stood off the screen when parked. Because that outer edge of both sides wasn't touched, it wasn't cleaned. Hopeless as that's exactly the bit of screen you need when parking.
Original Porsche ones did everything right but were, quite simply IMHO, overpriced for wipers.
Halfords own are absolutely fine too - clean the outer edges of the sweep, follow the curvature of the screen, work well even at excessive road speed, don't fall apart in two weeks flat, and are completely quiet. Price at ca. £8 ea IIRC. And we get through loads of wipers in the North West due to more-than-normal precipitation [8D]
I've never had the tapping problem with any of the wiper sets so happily haven't needed the rubber spacer. [
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