I've had some bad experiences with this yeast and am also interested in what styles really work with the yeast.
I've made two brews with K97 - one wheat fermented warm, one barley fermented cool. In both cases the late additions (orange/coriander in one, saaz in the other) 'shone through' to the point of overpowering.
I've read speculation here this is a dried Kolsch yeast. Have done a bit of reading into the style and, comparing my brews, this may well be the case.
Despite what is said above, my cool fermented K97 brew displayed virtually no fruity esters. Both brews displayed a vague sulphurey character. This has dissipated in the wheat, which was brewed months ago.
I'm prepared to give this yeast one more go at some stage soon. I'll probably do an extract Kolsch, hopped only for bitterness and fermented cool. (Any recipe suggestions?) If that one doesn't come out nice, I may well just not like this yeast!
Edit: spelling