I swore to that series of mice. I had both a blue and a red MX500, and later the grey, "dented" MX518. I feel like there was an MX510 at some point, too, but I don't remember it. When my final MX518 finally broke, about a decade ago, I needed to find as close a replacement as possible. I landed on the G402, which I feel comes very close. The shape of the shell is very close, as is the feel of the mouse in your hands. I've had no complaints with the sensors. It has the same buttons as the MX518, but the DPI buttons have been shifted a bit, with one of them now being thumb-accessible, and the repositioning is actually a great improvement. I feel like the biggest change is just one of looks, with a pretty big shift in style - but not in feel. A decade on, and I'm still using that mouse, so durability has held up - although, the wheel has started to become slightly unreliable at times, missing a scroll tick now and then. Oh, there's one other issue I can think of: the stupid built-in "RGB" (in quotes because there's no RG, only B), can't actually be turned all the way off - only lowered to a very, very low setting. You probably wont spot that it's not off in daylight, and in the dark the light is still so dim that you don't notice it out the corner of your eye, thankfully. Still, should be able to turn it OFF.

Would I recommend it? I've been really happy with it overall, and it saved my MX5xx-addicted ass from having to go cold turkey. But don't go paying some kind of overprice for it - it's a really solid, MX518-alike older model mouse, but not a literal miracle. I used to swear by Logitech, but reality is that there are other brands that could be just as good fits. The last mouse and keyboard my wife got were from Corsair, and I gotta say, they have been an absolute pleasure to use. Enough so that, even after 25 years of exclusively using Logitech mice and keyboards, if my peripherals broke down today, and I had to get new ones, then I would probably be liable to go for Corsair, and at least consider a variety of options from different brands.