I'm halfway through the series, and aside from some minor story issues, which I hope get resolved in the ending, I'm liking the story, so far.

If you liked Sisyphus, you might want to give 'Travelers' a try. It's a little longer, 34 episodes total, so it would take longer than 3 days to watch. But it has the same time travel concept of people going back in time from a terrible future.

Now I'm eager to get to the ending of this series.