If you are left-handed and your mouse is left-handed, you are buying the wrong mouse. I'm sure right-handed people will find it very comfortable, but I'll "be patient" with this as I bought it to replace a non-touchscreen laptop that I only use when I travel. I went back and looked closely at the photos after opening them and I think I should have figured out the left groove was for the thumb, but hopefully I'll warn some left-handers of the issue.
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