There is a material / coating that is commonly used in consumer electronics that eventually deteriorates into a sticky mess eventually making the products unusable and unsaleable.
Sadly, the current Elektron range uses it on the Trig buttons fortunately these could easily be replaced, but some products like Ableton Push are completely coated in the crap.
It’s hard to know if a product uses this coating especially when buying gear online so I figured it might be useful to list music gear that doesn’t use this rubberised coating so you can make an informed choice. Feel free to add to this list.
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Pulsar-23
Lyra-8
Dirtywave M8
OP-1 (though early OP-1s have yellowing buttons - doh!)
OP-1f
Pocket Operators (not the cases)
Hapax
Modular gear (knobs are replaceable)
Organelle
Elektron (pre-2015)