docs/random/ergo_m575.md


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# I'm Using a Trackball (Logitech ERGO M575)

2022-06-24

I've always heard stories about people worshipping the trackball for e.g.
comfort, precision, curing their carpal tunnel, etc., but I've never used
one… until now.

Note: this blogpost has no insight whatsoever. It's just me talking random
stuff about my new trackball.

![Top view of the trackball. It is asymmetric. A shiny blue trackball (3-4
cm in diameter) is on the left. The chassis on the right is made of black
plastic, has a "logi" logo, and features two mouse buttons and
a scrollwheel. At the tip of the left button there are two protruding
buttons in a vertical layout.](img/ergo_m575/top.jpg)

Joke's on me, the first thing I did after putting it on my desk is to
instinctively attempt to drag it around. Obviously the rubber pads on the
bottom stopped me from doing that.

![Left view. The trackball fits inside a socket.](img/ergo_m575/left.jpg)

![Right view. There is a groove along the bottom for the side of your
palm.](img/ergo_m575/right.jpg)

![Bottom view. A mostly flat surface except for an engraved "ERGO M575",
a few rubber pads, an on/off toggle switch, a dongle/bluetooth switch
button, a hole exposing bottom of trackball, and the lid of the battery
holder.](img/ergo_m575/bottom.jpg)

The hole on the bottom is large enough for me to poke my pinky through and
push out the trackball.

![Left view after taking out the trackball. The ball leans against the
chassis and looks glittery.](img/ergo_m575/trackball.jpg)

It turns out, like a regular optic mouse, it's also laser powered.

![Closeup of the empty socket. There is a laser transceiver deep in
there.](img/ergo_m575/socket.jpg)

The three tiny white dots you see are rollers that support the trackball
and maintain friction. Allegedly, these were made of steel in its
predecessor, M570, but now they are plastic.

I've been using this for a dozen hours now, including web browsing, file
managing, text editing (in LibreOffice and vim), and CAD. Here's what
I feel about it in general.

## Pros

- It's beefier than my old ThinkPad mouse and fits my hand better
- Trackballs are cool
- The Logitech® Unifying™ USB® receiver works out-of-the-box on Linux®
- The motion is smooth and detection is precise (but I have no proof that
  it is more precise than my regular mouse)
- The ball never slips my thumb
- It saves desk space
- It's taller and thus less likely to get buried in piles of paper
- I no longer have to worry about pressing forward/back by mistake when
  clicking the middle button

## Cons

- The right mouse button is too sensitive and sometimes depresses under
  the weight of my hand
- The left and right buttons on the scrollwheel are now two discrete,
  vertical buttons without context
- I just found if you hit these buttons with the tip of your finger real
  quick, you can trigger them electronically but not mechanically
- It's unfriendly to left-handed people
- It's harder to orient my hand immediately upon contact
- Hence, it's harder to switch my right hand from keyboard to mouse
- Hence hence, I'm more reluctant to do the reverse which puts more burden
  on my left hand
- The trackball feels kinda like a touchscreen you swipe on with your
  thumb. I was urgently producing some SVGs one night when I realized my
  actuation was less precise than before. Luckily I finished them before
  any lasting fatigue. (2022-06-24 update: Guess what else to blame?
  A piece of grime stuck on one of the rollers, now that I've taken out
  the trackball to check. Now it's smoother but I still find it tiring
  when used for hours.)

## Conclusion

There is no conclusion. I told you there is no insight. I just wanted to
share some cool new hardware. Now go do something else.