Most of the problems with keyboard switches I've worked on have been caused by the user--not manufacturing quality. Sure, there have been a few cold solder joints, and there is an occasional sticking button, but that's fairly rare. I have, however, known folks that have actually broken keyboard keys, worn out pots, and punched fill buttons so hard that the pads beneath the button were totally destroyed. For those folks, there's no keyboard on the planet that would be sturdy enough. In the past 20 years, and a dozen keyboards later, the only repairs I've had to make was replacing a couple floppy disk drives, and resolder one output jack to the PC board because it was not properly soldered during manufacture.
Cheers,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)