I have medium-large hands (18.5cm) and this mouse is the perfect size and shape for my hands! It features one of the best optical sensors you can find in a mouse the Pixart PMW 3366 that is super accurate and gives that 1:1 feel when using the mouse. In games, I cannot make it lose track or spin out, even while doing the tilt-slam test. The mouse is rated to 12,000 dpi/cpi but the average person will not use more than 2000 dpi/cpi. It should be noted that this particular sensor can only track 2,100 dots per inch before it begins to subdivide the dots/pixels. Although Logitech handles the subdivision extremely well, subdividing the pixels theoretically introduces more room for error in the tracking. Other than that, I highly recommend this mouse! However, if you have small hands, it may not fit very well. This is a larger mouse and smaller hands may have issues with accuracy and control. I'm not saying it's impossible but just saying that it's something to consider. Although the Omron switches used for the left and right click are really good, they are built to be sensitive. Occasionally, if I'm in a intense battle, I have the tendency to slam the mouse down a little harder than normal when I reposition the mouse. Usually I rest my fingers on the right/left mouse buttons and when I slam the mouse down, the mouse may register a left or right click. This is most likely due to my technique. This is reproducible on just about every single mouse (gaming or not) that I have used, but some mice do it more easily than others. the Logitech G403 Prodigy is one of the easiest to do this on. But this is a gaming mouse, and all of the buttons are easy to click, tactile and register instantaneously thanks to the 1000hz polling rate. Pros: -Comfortable shape -Smooth rubber on sides to aid in grip -On board memory for gaming on different computers -Automatic Application based Profile Switching (While not using on-board memory) -16.8 million colors -Adjustable DPI from 200-12,000 in steps of 50 -Logitech Gaming Software: Lightweight (Also provides an option to monitor system stats via Arx) -Finger grooves on M1 and M2 -5 DPI settings per profile cycle-able via DPI button -1000hz polling rate (no input lag) -Top sensor (Pixart PMW 3366) -10g weight included if you want (I recommend keeping the weight in for better mouse balance) -Logitech packaging is the best, the mouse cable is wrapped around as opposed to folded and then tied up (no kinks vs kinks) Cons: -Sensitive Buttons (For some) -No dedicated side scroll (can be mitigated using macros)