I used Lemmy quite early on. I love that it's made in rust, it did have some speed problems at first but it seems more optimized now. My problem with Lemmy is the same things I don't like about reddit, mainly strong biases in political leanings and problems with moderators. Lemmy is IMO a better made alternative to Reddit but it suffers from small userbase and potentially similar problems with user/mods if later on it's more successful.