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Having said that, replacing a 150V capacitor with a 500V unit isn't a good idea, as these type capacitors like to have nearly rated voltage applied. Otherwise they can get leaky and drift in capacitance quite a bit. So replace the 150V rating units with 150-200V rating.
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I've heard that before, but I've never seen
any actual data to back up such a claim. In fact, all the application notes I've seen from the major capacitor manufacturers show that to be untrue. Temperature matters, applied voltage does not (as long as it's under the rated voltage, of course).
That said, it's still usually a good idea to use something close to the original, simply because lower voltage caps are usually smaller and cheaper.