It's pretty much replaced twitter for me. That is, I don't go there unless someone posts a link.
It's ok. I used to use it a lot more. There is a hexbear aligned instance which is cool. But a lot of mastodon is very lib. In all honesty, Bluesky had replaced it for me. A lot of communists and socialists to follow. The only major downside I can think of is there is a lot of horny posting. And I'm just not interested in seeing anyone sexualized on my social media.
Bad: it takes forever to build connections with people Good: it takes forever to build connections with people
It's cool for some stuff, I follow a lot of artists and indie game devs on there and it's nice and chill. The people I follow are supportive of each other and it feels more like a community than like a marketplace. I was never into twitter though so I dunno if people looking for that will like it.
It's nice, I like it a lot so far.
A lemmygrad user recently made a new instance, It's not actually mastodon I think but it's federated with it: https://spectreofcommunism.boo we aren't a lot on it still so it would be nice to have more peoples over.
Alternatively, you can try the Hexbear aligned instance https://toots.matapacos.dog it even have all the hexbear emojis.