So I was looking for a portable mouse that I could use with my macbook when doing CAD work and handling spreadsheets on the go. I already have the big brother of this one, the performance mouse mx, and I love that mouse too on my desktop. I figured this one would be as good, and it is! The sensitivity and tracking is super smooth, you can customize the mouse buttons to your liking, and you get many options. The scrolling wheel is amazing, once you try it you will never want to go back to the old clicking scrolling wheels. Also, the pouch that it comes with is very elegant. Even though the mouse is small, it's ergonomic shape fits into your palm very well. The only con I would have is that it might feel too small for people with big hands, but then all portable mice are about this size. Great mouse, I would recommend it to anyone.