I played it in one of their free play weekends, and it had so many glitches. I spent an afternoon and evening trying to play it and have never bothered with it again.

It's got the kernel of something amazing in there, but it's insanely buggy (and essentially unplayable when it's busy, like the Free Fly events or right after a patch) and the pace of development is absolutely glacial. And you really can't trust anything the devs assure you is happening/on the way. It's unclear whether they're just bullshitting everyone or they somehow genuinely believe their own hype about deadlines, even after consistently missing all of them for over a decade, by a lot.

That probably makes it sound worse than it is TBH. There's a really cool game in there somewhere, but you have to be extremely patient with it.