Non-Breakable Logitech Marble TrackBall
 

Been through a few of them. Made to crap after a couple years, not
much more;- $20/US on sale but usually closer to $30 when time to
replace.

Ambidextrous, four buttons, and better than nice software for aspects
of ambidexterity Logitech published at one point if and before "going
to hell" as per par. Taught myself switch-hitting for a southpaw with
it;- an advantage for dropping off the left side of the keyboard,
which is the quickest wrist motion possible, as there's really nothing
more considering a center finger's fingertip is do any scrolling.

The two large click-buttons, the primary button, (right side of
trackball housing, thumb operable to lefthand), is a Logitech design
downfall for faulty premature wear.

The extensible fix is the two assignable smaller buttons, above the
aforementioned two larger, being the larger are hardware-interrupt
driven at a standard default for all mice. Of course the smaller then
need come with a caveat in the form software Logitech used for
predefined macros, to their own defined OS "shortcuts", for
translating the smaller button pulse logic into an OS event sequence.

So, to make it all work better, meaning longer lasting between a
Logitech mouse turd, there is a provision among assignable software
listings for a same duplicate function, such that a standard mouse
selection event occurs both upon adjacently paired small and large
buttons.

Redundancy for using the smaller button makes it the rote
"finger-memory" selection, but, unless I'm mistaken, the smaller
button is actually more efficiently housed in structural casing, to in
effect last longer than the lower and larger. (I've only started with
this last mouse purchase, hardware which has stayed the same since its
inception perhaps 30 years ago.)

While, contingent upon, the OS and Logitech would provide for such
software;- I wouldn't count on it for an *NIX variant, for instance,
where default interrupts are required, meaning the larger tow button
default hardware recognition is to be expected, and, back around to
Square One: premature wear failure, in all of Logitech's
foresightedness.

Sad. Although IBM's J-Mouse, various fingertip touch-sensor planes
incorporated into keyboards have made the attempt, Logitech is really
the one mouse solution at present for a greatest efficacy, a combined
balance to "gesturing" at defined pixelation from the OS and keyboard
input, much as would a century-old Dvorakian layout similarly be
responsible for largely circumventing a debilitating syndrome
affecting one-liners and chicken-headed haunted-peckers.