 I have used three of these ergo mice at different ... Strengths: All of the well-documented ergonomic features. It really is the best mouse design.
Weaknesses: Manufacturing quality is not great. No mouse ball option.
Summary: I have used three of these ergo mice at different work and home locations. While I find the design to be a great improvement over any other pointer product, I am disappointed with the manufacturing quality and the apparent decision to go optical and drop the ball, so to speak. The last time I purchased one, I had to send it back because the left button had too much slack before contacting the switch. I had to press the button down flat with the casing before it would make contact. I sent it back to the vendor and received another one with the exact same problem. Rather than waste more time with returning, I just hot-glued a thin wedge to the left side of the rocker button to get the leverage to make easy switch contact. This problem seems to be caused by a systematic misplacement of something in the switch assembly.
Meanwhile, my older mouse has developed a different left button weakness. It has very little slack and it clicks easily, but I now have to press past the click before it actually makes switch contact. This started after less than two years of use. This means I have to click harder to make it work and it slows down my double clicks. Not a good feature for an ergonomic mouse.
My final complaint is that this vertical mouse seems to be available only in an optical version. I appreciate the value of replacing a mechanical, ball-driven with an optical system that never wears out, but I find the optical version somewhat frustrating when I need to lift the mouse and move it. Because of stress injury to my wrist and arm, my movement is not quick and accurate, so I need to use a fairly slow speed for pointer movement. This means I often have to lift and reposition the mouse. Because the optical system keeps working while the mouse is just above the mouse pad, I have to lift it straight up and put it straight down to keep the pointer from "sliding" back. This is annoying.
After I discovered the 3M vertical mouse, I was so happy with it that I immediately bought another one and started spreading the word to friends and forums. Unfortunately, I can no longer recommend it without some reservations.
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