I've had three mice from logitech since 2004 starting with the MX510. I think I needed to cut out and rejoin the cable twice close to the mouse body after the conductors broke inside the insulation. The third time it happened I bought a MX518 and after much use the left switch gave out. I first replaced it with a switch I desoldered from something but it had a different feel than the original so I settled on moving the scroll wheel switch to left and replacing that with the spare. Having a different feel in the scroll wheel didnt matter to me. I might have had to cut and join the cable once or twice on that. When the cable failed again I decided it was time to try these newfangled laser mice and bought a G400. Actually I think I gave the MX510 away after cutting out the bad part of the cable again and it's still running today under light use.
One switch failing in 20 years with about 7 years of heavy use (thousands of hours of first person shooters) is not bad quality in my mind. The cables could have been better.
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