I have a simple rule about upgrades and never replace working parts with incremental upgrades. If this would be a low cost trade on a new bike purchase, it's up to you. But if you're going to spend money, do a quantum leap to something 2-3 levels better or in the case of disc brakes consider hydraulic.
Small incremental upgrades are rarely worth the money and often leave you wishing you either didn't bother, or skipped to the next level.
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