I used the G502 for more than a year and a half and loved it until the sensor decided to take a vacation and do whatever it wanted. It came to the point where I had to change my DPI and in-game sensitivity almost every round and I couldn't find out what was the issue for the life of me. I just knew it didn't feel right and it came to the point where I got mad and slammed it on the desk too hard and made it unusable lol. That got me to the next one G402. Honest to god I would have bought the 502 again but I saw this for a lot cheaper and decided to go for it and BEST DECISION EVER.Now to the actual review which is going to be more of a comparison with the mouse i know and loved the most, the 502.First of all, size wise its slightly and by the tiniest of margins, bigger than the 502. That was awesome because most of the buttons are positioned more away from the default position of my hands so I haven't had mis-clicks at all (I have small hands and use a claw/palm hybrid grip) . That was a huge problem with the 502 as I would mis-click a lot and change my sens in between rounds or ping something I didn't want to and it was sort of a pain in the butt so had to unbind all of the extra features and the dpi switching With this, even the sniper button where your thumb goes, I can't mis-click if i tried to. You need definite movement of your fingers to press everything and I love that. I honestly bought the 502 for the infinite scroll wheel and the side scroller but the amount of times i have mis clicked that and its changed weapons just because the infinite scroll was on was not worth it as the only time I actually wanted to use it was for reading long documents. Similar with the profile switcher which I had to disable because of the same reason.Weight wise its slightly lighter than its older(newer) brethren but that's awesome for me as I love a light mouse that I can move quickly, and i never had the extra weights installed on the 502.The clicks on the 502 for the main left right buttons are crisper than the 402 but really not a factor at all but the side buttons are crisper on the 402 which is great as it prevent misclicking which was the only issue I had with the 502.Quality wise, like all logitech products, it delivers (unlike razer mice, sorry fan boys haha I still use the blackwidow though which is excellent) with quality materials and a nice rubberized coating for a solid grip.The scroll wheel is some form of polymer unlike the 502 which is metal but I find it to be way more solid and crisper than the metal one so love it. Not really a factor at all.Another huge plus, (again for me not too many people like this) but the 502 had a braided cable that would get caught on everything, my monitor, the edge of my table etc. giving resistance while moving the mouse and ended up tearing it after use but this (402) has a standard cable and the problem doesn't exist at all.Overall I would recommend this mouse to anyone into gaming and because it was on sale I actually bought a second one for backup immediately after using it. Excellent mouse and great job logitech. Please don't stop production of it cuz I will buy this over any of the newer mice any day .