I believe you're talking about the 16k model. The 15k was released recently and has a different led configuration. It also raises the output from 160w to 180w.
In any case, I run a 16k razor over my mixed reef right now and I hate everything about it other than the way the fixture itself looks. The spectrum is awful and the controller is too simple. That being said I wouldn't touch a Kessil fixture over a full SPS reef, but at the same time I wouldn't use any LED fixture over a full sps reef (I'm referring to several grown out 10+" colonies). Been there, done that, shading sucks.
For a mixed reef, particularly LPS and Zoas, Kessil is great and so are other LED options. For SPS, I'll take T5/Halide all day long with or without LED supplements.