I bought it to replace the previous one, because it worked perfectly, but something went wrong. Of the many reductions in price, the backlash of the buttons affected the most, everything else is still tolerable. Metal heels have production burrs, which will later begin to scratch and cling to the coating. I dismantled the old and new mice: the new one has a terrible smell of burning, there is a black soot stain on the board, you can also notice that there is no weighting agent. I bought a new one, because the scroll stopped working, I will remove it from the new one and put it on the old one. New mouse only as a donor.