What caused it to malfunction after a flawless 500 rounds? Do you expect the problem to happen again after another 500 flawless rounds? These are rhetorical questions of course, but to be honest, for me the deciding factor would be that the gun is a Taurus, and based on my experience with Taurus, I would not trust the firearm to be reliable over the long run. Your mileage may vary.
What's your definition of over the long run? I've only shot 500-600 rounds through my new bought this year Taurus but my older one was made in the 70s. How much longer will it take for it to be reliable over the long term?