MR. Magura has a first ride review on the huckingkitty forum. He says the power is unimpressive but suspects they need a longer break in than the stated 5 minutes.
Honestly my Formula brakes have plenty of power that I'm not concerned with a slight change and their rotors are light enough that this will only shed a few grams. I've never even encountered serious enough fade to need this rotor's better heat properties. For me it's all about getting rotors that start out perfectly true and never get even the slightest wobble. It'll be awesome to never straighten a rotor again. I've never seriously bent a rotor but every model I've had frequently gets little wobbles from being bumped or sometimes out of the blue (from heat?). I hate hearing a rotor rubbing so I've spent plenty of time in the pits or trailside trying to bend them straight. This hopefully will remove that one little maintanence task from my life and I'll never have rubbing brakes again.
I am hoping his impression improves with more use.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Promising Carbon Brake Rotors