Just received today and it's quite amazing. It's very light, although I haven't weighed it on a scale (I don't actually have one, and it's so light that I don't really care because it's already light). I bought these as I was interested in the final shape of the mouse without the final price of the mouse as some mouse reviewers have said. I personally love it and almost everything about this mouse feels fantastic. As I have small hands the size is perfect for me because I can hold it however I want, be it with a claw, fingertip or palm. and my biggest complaint is the left and right clicks which are super, super easy and super, are super sensitive. I can't really put my fingers on it like other mice. To avoid accidental clicks, I have to keep my index finger on the scroll wheel and my middle finger on the raised edge of the cushy groove on the right mouse button (horrible explanation, hope the attached image helps). Great cable. flexible, had no problems with it right out of the box except for a crease but that was an easy fix. Mouse skates, as everyone has mentioned in Reddit threads, are very thin and can sometimes scratch the mouse pad. . Another reason why it scratches my mouse pad could be the hole where the sensor is. The honeycomb design on the bottom is great but I did notice that the hole where the sensor sits has sharp edges, and this could be the reason why the Sirius M is scratching my mouse pad. On the other hand, Sirius M comes with extra rails and grips that you can add if the mouse seems slippery. I personally have no problem gripping the mouse and it doesn't feel slippery which I attribute to its shape. In summary, the Sirius M is a perfectly formed mouse with a few minor flaws. At the time of my purchase, it doesn't really look like a $70 mouse. I'll talk more about quality control when I use it for a longer period of time. I'm considering swapping the switches, although I have no idea how to open them and am too lazy to check if there are screws under the mouse legs. tl; dr: overall a 4/5 good mouse, may need some tweaking. I have no problem gripping the mouse and it doesn't feel slippery which I attribute to its shape. In summary, the Sirius M is a perfectly formed mouse with a few minor flaws. At the time of my purchase, it doesn't really look like a $70 mouse. I'll talk more about quality control when I use it for a longer period of time. I'm considering swapping the switches, although I have no idea how to open them and am too lazy to check if there are screws under the mouse legs. tl; dr: Overall a 4/5 good mouse, maybe needs some tweaking. I have no problem gripping the mouse and it doesn't feel slippery which I attribute to its shape. In summary, the Sirius M is a perfectly formed mouse with a few minor flaws. At the time of my purchase, it doesn't really look like a $70 mouse. I'll talk more about quality control when I use it for a longer period of time. I'm considering swapping switches, although I have no idea how to open them and I'm too lazy to check if there are screws under the mouse legs. tl; dr: Overall a 4/5 good mouse, maybe needs some tweaking. cost $70 at the time of my purchase. I'll talk more about quality control when I use it for a longer period of time. I'm considering swapping the switches, although I have no idea how to open them and am too lazy to check if there are screws under the mouse legs. tl; dr: Overall a 4/5 good mouse, maybe needs some tweaking. cost $70 at the time of my purchase. I'll talk more about quality control when I use it for a longer period of time. I'm considering swapping the switches, although I have no idea how to open them and am too lazy to check if there are screws under the mouse legs. tl; dr: Overall a 4/5 good mouse, maybe needs some tweaking.