system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How often do Sith go over to the Jedi way of life?

Obviously Darth Vader went good at the last minute. But how many other true sith ever went bad then switched over (going evil for an hour then realizing the error of your ways doesn't count). 

I don't read much of the EU so I truly want to know how often this has happened.
gpt
It happens very seldom. We hear about more Jedi going to the Dark Side, because they are more in the public eye. It is also easier to slip into Dark Side thoughts, as the Jedi hold themselves up to higher morals. 

There are only a handful of Sith or Dark Jedi who have come back to the light, though. Zekk, Tahiri, and especially Vestara being the three most notable in the modern time.