I'm a filthy casual, and I think I'll be staying. I might try out Kbin when they get a mobile app, because I'd like to be able to follow mastodon and the fediverse versions of reddit from the same app. But I love it here so far. There are a few subs I really miss (witches vs the patriarchy, some science subs, and a whole bunch of academic and religious subs), but I'm fairly confident that most of those will make their way here eventually. If not en mass, then a trickle of like minded folks.