Razer's big problem is a large percentage of rejects in terms of button switches. The problem is not that there are non-working instances, but that there are mice with crooked clicks, especially on the left buttons. I don’t know why they have this, but this is already a statistic, and not an isolated case. On the first Desadder that came to me, the left button, instead of a click, made a sound similar to crackling, and double - "click-click". However, the button worked. Returned. The second time came a good copy. Previously, their mice came across with a kind of cottony, not perceptible click, as if the button had survived 1 million clicks. In short, it's a matter of luck. In fairness, it should be said that finding a mouse with the same click on the left and right buttons is probably not realistic in principle. Even my current pressures are slightly different in effort, however, fortunately, they are the same in pre and post travel, elastic, which makes me very happy. Conclusion. Find a good device, you will get high.