I really liked the Performance Mouse MX which was the first in the line but i honestly don't what they're trying to achieve by taking and stretching every contour of the original design to the point of absurdity. I would have loved to hear the board meeting where they thought that stretching the thumb rest out so far you could land an F35 on it was a great idea. Logitech Mgmt: We've decided to take the popular thumb rest and make it even bigger, because bigger is always better! Logitech CEO: Nice work Milton! I now have somewhere to land my helicopter! APPROVED!