I recently tried rewatching.

I enjoyed the first couple of episodes, but didn’t feel the need to binge through the rest. I do plan to keep working through it.

It definitely stands up reasonably well. I found I paid more attention to the visual language and production design which seems to be a profound influence on Star Trek’s new 32nd century’s production and costume design. Story and character wise, the popular new SyFy series The Ark owes quite a bit to Space 1999, and seems to have found a happy medium between the two seasons.