Worth it for any Factorio addict
There are a few things I could gripe about. But I finished it after about a month of intense play, ~200 hours, and then started again. What more can you ask for?
Yeah, some parts don't quite have the same level of polish that the base game does, but that's to be expected since they didn't have 10 years to polish it. In short, even if it's a little rougher, it's more Factorio. If you love Factorio, what are you waiting for?