I am using this mouse everyday for gamedev related work. I think I been using it for a few months, the mouse starting to show some problems.
First the left side of the mouse where the thumb is, it starting to get really sticky. At first I thought it is my thumb that is oily but after covering it with a cloth, it is still somehow sticky in that area. I think some of the gaps have some glue issues.
Then second, the mouse wheel broke - not able to scroll up and down easily.
Third, the mouse isn't that sensitive to click the thing that I wanted. Sometimes I will accidentally click on something else that is near.
Forth, there is a button on the left side that is in a position that I will accidentally click on and go back. This makes me lose some unsaved work. Not sure if that button is really needed or necessary.
The mouse has some nice design and the click surface is pretty comfortable but not suitable for long period of use. I think my previous mouse holds out for a few years + before breaking. This one breaks pretty fast. But for my case, I am using it intensity everyday.