Well, so far I have had my Rat MMO7, and Glide9 mat for one week, and absolutely love them. The Rat MMO7 is the best mouse I have ever used! So far not one issue! Anyone put off by issues other people have written about, I say go for it! This is running on a Mac Pro desktop 12core to boot! I feel the build quality is first rate! The Glide9 is a wonderful mat for the Rat mice. Tracking is flawless, and the mouse glides across the mat as if floating on air, with just the right amount of resistance. A well engineered system.