That's one reason why I prefer the "alternate" ending where Dantes ends a broken man, where he is consumed with self-doubt about whether his actions were justified or not.

If you get the Robin Buss translation I would say absolutely. Not only does he do a fantastic job with the footnotes, but he adds things back in that were excised because of Victorian sensitivities. Is it enough to make it worth it? I like so, it is just much richer and fuller than any of the Victorian era translations.