This is my CSGO player journey with 19cm x 10.5cm hands. I've been using the Logitech G403 for over a year. I liked everything about the G403, especially the crisp feel and light weight. However, over time I noticed that I was constantly placing my ring finger on the upper right edge of the right button. I was able to grip the mouse best with two fingers and my palm in hybrid mode, but after long gaming sessions I often found it easier to place all three fingers on the mouse and scroll with my middle finger. steering wheel and my ring finger for the right button. In the end I came to the conclusion that the front of the mouse was too wide for me. As much as I liked the specs of the G403, I decided that I had to find a more comfortable mouse. After a lot of research, I decided on the Rival 310 precisely because of the narrower front dimensions. Overall I was about 95% satisfied with the Rival 310. Considering the overall comfort and the narrower front, I noticed that I could aim better with it than with the G403. However, after a few weeks of use, I came to three conclusions. First, while I liked the shape, it was difficult to deal with the drastic change in size depending on where each finger rested on the mouse; I had to be thoughtful and careful when holding the mouse to feel consistent. Second, I felt that the top keys were too tight, causing my fingers to feel sore after a typical night of gaming. Third, its idiosyncratic shape, with its hump pushed back, lends itself perfectly to grasping with claws or palms. but didn't feel as good for my fingertip/palm hybrid compared to humpbacks in the more traditional central area of the mouse. the cable, the unnecessary weighting system, and the addition of a second sensor to detect lift-off distance (which Razer and Logitech mice could match with *sigh* just one sensor for literal years, which is decades in mouse years) - it all turned me off. I probably placed an order and canceled it 20 times before finally pulling the trigger. Well I'm very glad I did. It is immediately noticeable that both plastic and silicone feel silky and excellent. Also, the feel of the top clicks far exceeded my expectations; They feel pretty much the same as the G403. Most importantly, the shape of the mouse is exactly what I was looking for. While 600 and 310 are rival mice, 600 is a new version of the form. The hump is further forward compared to the 310 and the mouse buttons are slightly higher and flatter compared to the extreme drop of the 310. All of this combines to create a much more comfortable shape for my grip. It really fits my hand like a glove and I'm very happy with it. With some tweaks, the lift-off distance is better than the 310, but no better or worse than the G403, which is also adjustable. The only relative weakness of the 600 compared to the 310 is that the side buttons are smaller and a little less user-friendly. Hope this comparison was helpful! ---------------- EDIT (2018/03/25): After trying this mouse for a little less than a month, I decided to trade it in for another mouse. There are three reasons for this: 1. I have large hands, and my most comfortable grip position forces my thumb to rest on the non-standard farthest mouse button. However, I still want to keep my thumb on the smooth silicone piece just behind it, although bending the thumb backwards isn't as comfortable. This discomfort, although minor, is present every day, every time I use the mouse. 2. Silicone material on both sides and on the top main mouse buttons looks nice and smooth. I think however that they also trap more heat. My hands sweat a lot when playing with this mouse. The positive here is that dirt never accumulates on this mouse. However, this heat issue is a deal breaker for me.3. The right and left sides of the mouse are very smooth due to the silicone, however both sides are beveled upwards resulting in a slippery hard time when trying to pick the mouse up. I have to press harder than I want and my hands get very tired during a gaming session. This is exacerbated by cause 2. I recently had to fix something on my wife's computer that I had my Deathadder plugged into over a year ago. Holding this mouse again was great and reminded me of my 20's playing with this mouse, and aside from the double button click problem that plagued the first few generations of Deathadders, I've always felt that the Deathadder's shape was very comfortable. By this time I was also familiar with the Rival 600 and it wasn't working as I had hoped. My journey with a gaming mouse continues to the next chapter. From Deathadder 3G (button problem) -> a whole bunch of mice -> G403 -> Rival 310 -> Rival 600 ->