Of the advantages, a good sensor should be noted, there is no double click. High accuracy. BUT! Not for this money. Before that there was a Bloody R8 for 7! times cheaper. Served without problems for 4 years and it has everything the same. And she is still working. I decided to change to a more ergonomic Razer and regretted it. The biggest drawback is that the battery lasts only 12 hours of active use, compared to 36 for the Bloody. Probably the backlight kills all this, although the sleep mode is on. The plastic creaks and the most miserable thing is that it gets very dirty and is sooo hard to rub off. In general, for the design 5 and for the implementation of 3. For this money, it should be made of titanium.