Same here. Thumbs down on Brembo rotors (which I've used on and off for years), big thumbs up on Zimmermann (which I originally used decades ago and have now gone back to). Definitely worth a premium price. I really lucked out last fall and got two sets of front Zimmermann Coat-Z on distributor closeout at half price. Only needed one set at the time, but bought the last four they had knowing I'd never regret it. They're now on the shelf earmarked for my other 940 the moment the Bosch Quietcast fronts start acting up. I'm also done with Bosch Quietcasts. The Bosch Quietcasts that were on the other car had to be replaced prematurely due to developing uneven rust pitting and uneven bedding material (used with the Bosch Quietcast pads, so no excuse for that) which made for excessive brake pulsation when hot on the highway.

As noted in another recent post, I'm now into using Pagid pads on the fronts and have been happily using blue box Volvo pads on the rears for decades.

Which rear rotors do you like? I've not zeen Zimmermann rears available in North America, only in Europe. The Coat-Z for all Volvo RWDs with the later rear ATE brakes are their prod# 610.1171.20, while their slotted Sport Coat-Z are prod# 610.1171.52. I'm going with genuine ATE for the rears at the moment.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now