I own a Bell Volt, Giro Atmos and Catlike Mixino along with my Catlike Whisper Plus, and I can honestly say that the Whisper Plus is the most comfortable helmet of the lot. It's certainly not the lightest as the Mixino takes that spot. However, what it lacks in the "lightweight" category is more than made up for in the "comfort" category. In other words, it fits my head like a glove. The Mixino and Atmos feel very similar in that they both put pressure on the side of my head. They're more suited for someone with an oblong / elliptical-shaped head, while the Whisper Plus is more suited for someone with a rounder head (when viewed from the top). Aside from the comfort, the Whisper Plus is very distinctive as it doesn't look like any other helmet in the market. What's not to like?
However, If I were being nit picky, I would say that the rear band adjuster on the Whisper Plus is not the easiest to operate. I prefer the micro-dial adjuster on the Mixino and Atmos. Other than that, I'm pretty happy with my Whisper Plus. So happy, in fact, that I ended up buying another one tonight.