I have Conquest Customs ceramic rotors on my Kingpin. And I’m very pleased. I was attracted to them for weight reduction, if you’re not familiar with the difference between sprung and unsprung, not to mention rotational weight, everything below the shock and spinning has a significantly greater impact on the bikes handling than weight changes above the shock. So at 1/3 the weight I was interested and I CAN notice the difference in handling. Flicking my bike left and right into sweepers and S curves it feels like a lighter, more nimble bike.
Now to the braking performance. They’re fine. They are different. The first time you pull your front brake after installing these your first thought will be “squishy, do they need bled?”. But the next thing I did for lack of a better phrase is I gave them a break in procedure. I rode fast and hit the brakes hard. Then I did it again and again and again. To the point that my old brakes would have been damn hot and showing signs of fade, these just got better and better with each pull. The hotter they get, the better they perform. So after this seating or brake in or whatever you want to call it the feel now isn’t far from any other brake. With cold brakes where you may have previously pulled the lever back 4 mm to get 30% braking power, now I might pull 5 mm. I can definitely lock the brakes up, can definitely stop it just as short. Probably can stop it shorter now as the feel is more progressive and I can reach that point just prior to lock up without locking up easier.
So I would conclude that there is a difference in feel, at least initially. Performance is at a minimum equal to, likely a little better than stock when cold, and if you’re riding aggressively on twisty roads braking performance is better by a country mile. Which will be put to use as the handling improvements means you’re riding even more aggressively than before.