I used the old Tesco ones (none flat) and they left loads of scratches on my windscreen despite the fact i take care of my cars and make sure the windows are always clean. I've just stuck with Bosch or other well known makes since then. I think one of the last sets i bought were goodyear flat wiper blades from costco however i sold that car on so i'm unable to double check for you.
Rik.
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