I've had excellent luck with Qualifiers at trackdays with my 919, I'm looking to repeat the success with my 954. I rode the things to the edge at NESBA Intermediate pace without so much as a chirp.

Maybe people aren't running them at the correct pressure?

 

The Q's are good sticky tyres and peeps are getting varying amounts of wear out of them.

Ride them hard on warm or hot days consistently and they'll do what you expect: work but wear fast.

D209s are in the pipeline. Don't know more than that.

Corsas and Supercorsas are also good hard riding tyres acc. to my mates that run them.