I've played SC on and off. I've gotten my money's worth for sure.
The dogfighting module is pretty polished, it's fun to run on the flight simulator and VR headset. It's my go to space sim as there's nothing that compares even though it's not done.
The persistence module is fun to dick around with, the seamless landing on a planet and exploring is cool as shit.
I don't have a rig to power the FPS module very well so I can't give a fair review, but the mechanics and controls seem fine.
Love the immersion and I follow it asynchronously. They're still going at it and I applaud the effort. Would rather have a great game eventually than a shit dead game a year ago.