After a year and 2 months of use (only 10% are MMO games, and the remaining 90% are office and surfing), a classic Logitech sore appeared - double click and poor scroll wheel performance (when scrolling down, the screen jumps up and down). I contacted Logitech support - they recognized the warranty case and sent it to the seller with a letter of guarantee, the seller - Market. I contacted Market support with a warranty case. Let's see how they work out this case - I will add a review upon the fact of solving or not solving the problem. In any case, this will be the determining factor for the further use of the service.