I'm tempted to try it just out of curiosity. Any idea how much content is complete? I haven't paid any attention to this project in quite awhile.
Of the promised content? Impossible to say since the promised scope remains insane. They have maybe "finished" a very small single digit percentage (2%?) of the game in total and that's a very generous estimate.
For example, 100 star systems were promised for launch as per the $6 million stretch goal. There is still only a single star systems, albeit fairly well fleshed out by now with many individual locations.
Many other gameplay systems are missing. They promised very detailed and intricate gameplay systems for every ship type and pretty much none of that has materialized beyond a basic form yet.
An excerpt of the missing gameplay systems just by ship/ship type would be: Smuggling, bounty-hunting, trading (you can trade in the current game but they promised a much more sophisticated in-game economy), exploration, mining, salvaging, science & research, piracy, electronics warfare, tourism/passenger transportation, and the list goes on and on… it's insane.
In typical CIG fashion they have promised super-deep, super-detailed systems, too, and going by the current pace of development over the last ten years we are easily and without exaggeration talking decades more of development work before those gameplay systems will ever be finished at the promised level of detail and quality.
Of course free is free so it's safe to give it a shot and try for yourself. I'm a day 1 backer, got suckered into it by the hype back in the day and backed the game with a substantial amount in 2012. I am disgusted with the project and its leadership because of all the lies over the years. For me, it's easily the biggest disappointment ever in my gaming life.