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I've had both. As much as I like rotor, unless you're strictly riding them on the track they develop play on the driveside via the spider and crankarm (they are held together by 4 torx bolts pretty close together). That was my only issue with them and it does get a bit annoying having to warranty them time and time again. Funnily enough I've only had play with the newer model (not the silver black matching lines model pre 2014 I think..)
But yeah. 2p.
I'd be really interested to see a back to back comparison against Rotor alright... nice to see someone else entering the market though.