Unique ergonomic design with accurate cursor movements
Logitech discontinued this mouse a long time ago due to a lawsuit with someone who owned the patent to a "trackball controller which is operated with the fingers and the thumb simultaneously", which is a shame because this is arguably the most unique mouse ever invented.
The FX design keeps your wrist straight during operation which helps with long term use. The FX also has a large trackball which can easily be operated with multiple fingers. Although the DPI is low compared to modern mice, the ball doesn't stick at all which results in a hyper-accurate cursor pointing device. As someone who needs fast navigation in conjunction with small precise cursor movements, this is one of my go-to mice.
This mouse does not have a scroll wheel, but can easily be mitigated with use of the third mouse button. The placement of the third mouse button makes using the auto-scroll extremely convenient and I almost prefer it to a modern scroll wheel now. In some programs that don't map the third mouse button, you unfortunately have to use scroll bars, but due to the ease of cursor movement this is less of a task than it would be using traditional mice.
The Logitech marble FX mice are ~20 years old now and still function like they are new, which shows the build quality. Logitech has since made an ambidextrous replacement for the Marble line of mice, but the new model of Marble mouse does not offer the same ergonomic/cursor experience as the FX did.
If you are going to run the Marble FX on a more modern operating system such as Windows 7 and above, you might run into issues mapping the fourth mouse button(red) depending on your driver setup, other than that the mouse is still a pleasure to use, even in 2018.
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