Evoluent VM4SW VerticalMouse 4

I have purchased several over the years. First the mouse drifts all over the place as if you are fighting with the mouse, or someone else is trying to control your mouse. The technology is dated. If you turn the mouse to the bottom side there are several design flaws. You will see 4 "pads" on the bottom, 2 larger on front & back and 2 very small on the sides. Well, if you think about a bicycle with training wheels, it's the same concept, so if you try to move left or right or kitty corner, it's like tipping over. Very straining on the arms. AND over time the pads wear. So, if you imagine your bottom shoes where it wears on one side, guess what... the same idea. Again it makes it very straining on your hands.... like tires wearing out. It's only designed to go forwards and backwards. Second, the mouse drive is so outdated. It has not been updated since 2015 and uses your system application, which it just again fights with each other. Third, Evoluent appears to have minimized cost in material. As mentioned, I have purchased several and the size of the mouse is smaller than in the past. So small the it is at a 90 degree slant and puts strain on your bottom side hand and two smaller fingers. The mouse again drifts so widely and you have to literally move it 5 inches to span your screen. I want minimal movement. NOW, let's talk about the pointer! Ugghhh, the pointer fights with you, it takes forever to "snap" or locate where you are at and drifts all over the place other than where you want it to go..., it again hurts the hand. Tracking is is horrible. WIth technology today, I want something that meets the fast paced environment, not a scooter. This used to be a top -rated mouse, just another pain on your ergonomics. ONE last note. BIGGEST upset... every time I start my computer, the mouse is is not recognized. I have to take out the adapter from the USB port out and re-attach. REALLY? I do not want to wear my USB port out for a dysfunctional operating system. Depending how you connect the USB port to mouse back in, it appears the mouse control ability degrades more than the above mentioned.