Review on Evoluent VerticalMouse Ergonomic Wireless Connection by Drake Burroughs

I like the upright position of my hands and the handling is very comfortable. This is where the positive aspects almost end. Less than a year later, I ran into tracking issues that rendered it unusable (jumping up to 4 inches on a 27-inch unusable type screen). Their tech support determined the problem was their own software and advised me to use a third party. Third-party software, which tech support itself admitted, didn't cause tracking issues. If their tech support recommends third-party software because their own software is too buggy, that's a huge disadvantage. Fast forward to review: The tracking issue is back in full swing, The 5th mouse button has completely failed and both the left and right mouse buttons seem to be failing as clicks are no longer registering (sometimes I have to click 3+ times, so that a button press results in the mouse I already have 1.5 years could not be more disappointed since this suction cup cost a penny.