After half a year, the left button began to fail / stick, the sensitivity began to act up even earlier. Because of the sensitivity, I bought a pad separately (A4Tech X7-200MP (no, not advertising, just to show that the pad is not "noname")), I thought the problem was due to its absence - the cursor became smoother, and the mouse slowly began to fail more and more often and more often (hang). In general, I'm upset that I'll have to take a new one, because the last mouse for 200 wooden ones served for about 4-6 years, until it died at once, without problems "appearing" over time. : At first it was uncomfortable, and my hand was sweating (the mouse heats up by itself), but I soon got used to it, and my hand stopped sweating.