I use it daily.
Of the two different things I used Reddit for, Lemmy is a 100% replacement for one, but sadly lacking in the other.
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Current events (news, politics, etc...) the transition to Lemmy was seamless.
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Tech Support on specific niche software (kdenlive, Scribus, Gimp, etc...) is still lacking. there aren't a lot of communities dedicated to specific hobbies where a person can ask and answer questions from other users.
In regards to #1, there is actually one area where Lemmy has an advantage in my case. Because my local instance is my country instance, having that third "local" option means that I can, without any searching, keep up to date on national current events as well.
it's like being in a Canada only news site, and then if I want, I can hit "all" and see the rest of it. it's super easy in a way that Reddit couldn't be.