I have this kind of Recaro's in my EJ9 for years now. I got the grey alcantara's from a Lancia Delta HPE. Yes they are heavy (28kg driver's seat, 25kg passenger's seat). But they look stunning (except for the fact I am wearing mine out nowadays) and sit perfectly.
Yesterday I was driving my EJ1 with the Recaro's bucket seats which are ok to drive for a while, but then I entered my EJ9 with those Lancia Recaro's and it did wonders for my back. Put it differently, I would probably kill the person stealing those seats from me

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Once drove two Switzerland in one day (~800 km) and despite the firm suspension I had not a single back problem.