The Mionix Naos QG is quite the likeable device. Its simple aesthetics are a pleasure to look at (no hard lines, no drawn skulls, no bright orange flames, doesn't look like a cyborg), the grip is extremely comfortable, the optical sensor is a beast delivering impeccable accuracy, and the software is super simple to use despite being feature-packed and is clean (no weird fonts or neon lights).
However, there is a big "but": its price. At this price point, you could get a wireless gaming mouse or a mouse that is more customizable (more buttons, extra weights). While the heart rate and galvanic skin response sensors offer some nice insights into your gaming habits, their utility can be debated ("So, my heart rate spikes when I get ambushed in Dota2. What do I do with that?"). However, the gaming community is clearly interested in these statistics: this mouse was crowd funded, 840 backers pledging $107,125 to help bring this project to life.
The Mionix Naos QG is a unique beast, which means that it is one of a kind for those who want it, making it the one and only choice for those who want to quantify their gaming experience somehow. In such a scenario, it delivers on all its promises at a price of their choosing, but for all the more traditional gamers: you may want to look at all the other amazing mice Mionix has to offer.