I’ve been using it for almost two years now, and I like it a lot. (small disclaimer, I’m running it on a OnePlus 5T, which is one of their so-called golden devices that it runs best on)
It’s pretty much the next best thing after Graphene, if you don’t want to buy a Pixel.
The guy who maintains it does an excellent job of documenting issues, what works on what device, what the system itself can and can’t do, it’s very transparent.
He doesn’t overpromise either, and explicitely states that getting a Pixel with Graphene is the better option overall. Greatly appreciate the honesty.
I’ll use it for as long as he’ll support my device, and then we’ll see if I switch to Graphene.
One important thing though: While you can install microG, DivestOS doesn’t officially support it, and while most things work, some don’t. SafetyNet, for instance.