This Corsair M75 wireless mouse is great and is now my main desktop mouse. It's not a featherweight mouse, at 89 grams, but it still glides well. On/off is accomplished by long pressing one of the two buttons on the bottom of the mouse. The RGB illumination functions as the indicator that the mouse is working when I've got the mouse flipped over to press the power button. The DPI button is on the bottom too, so by default it's not accessible for in-game switches (although you can assign that function to a button on the top). The left/right button switches feel responsive and have a nice click to them and are optical.The real star feature of the mouse, for my use, is that it has the "forward/backward" buttons along both sides and they can be configured to all have independent functions. The mouse comes with four button caps that install flush with the plastic shell of the rest of the mouse and four button caps that protrude about 1 mm further. The buttons aren't as tall in profile as other mice but they're usable. I love assigning all four buttons to do different things and it's made the mouse my go-to mouse for a program that I regularly use hotkeys for navigating and refreshing in. It's also entirely possible to make it function in left or right handed mode with only two of those buttons working. I do find that buttons on the right side are pressable with a slight shift of my pinkie and ring fingers. I'm wondering if I can make those buttons slightly taller and the easiest solution I found was to use a small Philips screwdriver to slightly back out the screw that is the magnetic button attachment. Some texture to the raised buttons might help with confidently knowing my fingers are in the right spot before I press, but the truth is my fingers end up in the right spot even if I am not sure the buttons are there. I did find myself needing to use a pin to remove the button caps from the sides as the magnetic attachment is decently strong. I think a cell phone SIM ejection tool could be included in the box or you'd be wise to have one handy when experimenting with button caps.The opening to attach a USB C cable for charging is larger than most and that's sometimes more convenient than having a matched/specialized cable. The USB A to USB C cable is a nice, durable braided cable that can be used to make the mouse wired (and also charge the internal lithium battery at the same time) but the USB A 2.4 GHz dongle for wireless can't connect to provided cable. If you want to set this mouse up (without bluetooth) as a wireless mouse and occasionally make the mouse wired to charge the battery, you'll end up using two USB A plugs that way (or you could use bluetooth if ports are very limited).The software has a bit of a learning curve, but it's decently organized. It took me a while to understand the utility of "hardware key assignment" vs "key assignment (in software)" but if you're controlling multiple PCs with the same mouse it gives you a way to make custom profiles for each PC or universal/carried by the mouse.This is a premium mouse with optical switches and a lot of configurability. I'm really happy having some of the MMO-mouse sort of many-button functionality in a mouse that has a lower learning curve for my fingers. About the only wish I have is perhaps slightly taller buttons with some textured surface, but maybe that will become available or be mod-able with stickers.