I would have to say, having Supercats on my old Renault was less grippy than the Conti's I have tried on other ones (admittedly not OE either) but for what they are, they were good on fuel.
Though, I have heard horror stories of Supercats too, where one tyre wore faster than others though the alignment was mint. Frankly, if it wears too quick, or doesn't "feel " right, go to the dealer.