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Bosch model looks familiar, I have that, also I have AC Delco blade of similar style, it has smaller center piece so that it should be even better.
Thing is, I can hear wiper blade making noise, I put cardboard cowl and noise did stop, but between traditional blade and streamlined blade I have not found difference in consumption, also I think that there is no measurable difference with wiper cowl either, just sound missing, it is so small piece and also at rest it is pointing more or less along airflow as I have only one wiper arm mounted at center and it is pointing from center to side.
With cardboard cowl, there was no change in mileage that I could of notice.
These kind of blades however seem to be wiping screen better, pressure is perhaps more even, also ice is not effecting them so much as snow is not building up on these, so it has been worthwhile investment, just not in terms of aero.
AC delco one did go bad rather quickly, I don't think that it lasted even a month, but with good cleaning got it to work week at a time, Bosch has been bit better on that aspect. Both experiences are from winter use as summer time wipers are not used that much, not so much chance of driving at rain and no constant salt water spray from vehicles coming from opposite direction.
I would say that go for Bosch blade if your blades need replacing, but don't except it to save money, it does cost awful a lot at least in here, it was something bit over 40 euros while AC Delco was around 20 euros, conventional ones can be lot cheaper, but from my experience last less than what Bosch blade has lasted.
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