Cinestyle is way overrated IMO. It is a flat picture style designed to be graded, but the codec of Canon cameras is not good enough to stand up to this kind of color correction. As soon as you even drop in a basic LUT the shadows have picked up an insane amount of noise.
Read my post above. Cinestyle is ONLY for shooting b roll or crash cam footage on shoots where the other footage is in log mode. For anything else it's useless. It doesn't have more lattitude, it just places brightness values differently. There are a few cameras that shoot log (Alexa, C300, F3, film scans) and if those are your A cameras and they are shooting in log then cinestyle will give you (trivially) more flexibility and integrate significantly better into your workflow. I've used my dSLRs a few times as b cameras for 35mm, Red, and Alexa shoots...to be honest it doesn't matter that much but having log footage to intercut with log footage provides flexibility and a common starting point. In each of those cases we also had some footage shot in neutral mode and it was just a matter of grading it differently.
Otherwise, it is worse in every way than neutral. Worse tonality, saturation, and skin tones. More difficult to composite. For sound (excepting videography in which case that would be appropriate) I would buy a shotgun mic and an external recorder.