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Definitely depends on model and usage - my PRS505 is still in daily use after many years now and so is my wife's but a friends PRS650 failed multiple time (replacements dying off as well) so had to demand refund yet I have an older PRS650 that is also fine... there's a real element of potluck in these things, even calculators... I also have a stat calculator of decades age which still works fine (HP) but several other calculators died during the same period...
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