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So I did try the Logitech TrackMan Marble a few years ago and it's feels really nice for my hand but the non-existent scroll wheel and a missing middle button (in a comfortable position) made it unusable for me. I know all the workarounds for the scroll wheel but they do not work for me in the end. I heavily rely on the middle mouse button while browsing and it needs to be easy and soft to press.
Time passed passed by and I tried the Kensington Expert because it's loved by many. It's really well built and I can see why so many people like it. But the scroll wheel is plain awful if you compare it to newer mice, especially gaming mice. Removing the magnet did help somewhat. But my main gripe with the Kensington Expert is that it's plain too big for my hands. I have to bend my hand upwards in order to use the ball and that hurts my wrists, even after a few minutes and if I use the included padding. Also the position of a potential middle button (one of the two buttons behind the ball) was not comfortable for me.
I gave up on trackballs after that for a while until I saw the Logitech MX Ergo, I hadn't thought about thumb trackballs before that. It had really good reviews and looked like something that might be more appropriate. But before ordering it, I tried the Logitech M570 which is cheaper and might be an alternative for me. After only a few days, I'm able to use it fairly confidently and don't get slowed down at work because of it. But even the scroll wheel from a Microsoft IntelliMouse 1.2A (yes, that one with a ball in it) feels better in every regard. Hard to press middle button, mushy feeling, I just don't like the feel of it. But the M570 seems to be pretty much perfect for my hand - so much that I thought: Order the MX Ergo and you'll get the perfect trackball for you! But the Ergo is again just too big for my hands. It feels like work to keep my hand on the device as I cannot rest the hand on the table while operating the trackball. Otherwise, it's really nice and everything is a tad better on the MX Ergo compared to the M570. The only downside is a middle button that has a very hard click action.
So, long story short, I'm keeping the M570 for now because I can map the middle button to the forward button and the scroll wheel gets the work done and I can live with that. But I'm not here on deskthority because I like things that get the work done but because I love the feel of well made input devices. Is there something out there for me?
My wish list:
- finger or thumb operated, don't care
- nice scroll wheel
- soft middle click in a non-awkward position
- for smallish hands (19cm in length)
- no need to bend the wrist upwards
PS: I use a Razer Viper Mini as my mouse and that's a mouse that does everything right for me.