None of the problems mentioned here. No tracking loss, no empty clicks... nothing like that. The mouse has perfect weight, good grip, flawless placement of side buttons that are stable and responsive. It is one of the most beautiful ones I have seen, fits perfectly in the palm. And it doesn't lose signal even if it's lifted half a point above the mousepad. It's ridiculously perfect for its price, it even changes the brightness of the scroll button to indicate the DPI... It also seems durable!... But I doubt it at this price...

Very bad mouse. Heavy, no immediate response, not ergonomic to hold, loses the pointer during movement, and many other negatives. I left it aside on the third day.