Having read the many negative reviews, I was skeptical at first, but I ordered the mouse anyway. I have now tested on various surfaces for three weeks and I can only say: I'm happy. The new laser technology to work on many terrains, as long as the surface is not too rough, reflective or transparent. The mouse fits comfortably in your hand and because of their small size, they can also be very easy to transport. And with the two additional buttons next to the left mouse button is surfing the Internet faster than ever before.