Yep it literally works just like LeoFinance.. they are still developing stuff so it isn't perfect. At the moment, the most "leo-like" experience you can get would be on somee.blog.

That would be their HIVE outpost where you can just connect with hive keychain, I don't think you would even need a somee account to post/earn on somee.blog

Somee.social is the more "facebook-like" experience, but it comes with a bit more of having to deal with development bugs and shit like that.

For an existing hive user who knows how hive works, somee.blog is probably the easiest way to get started.

And yes, someeofficial tag will make your post eligible for SME earnings. I think you might have to add the tag at the original time of posting though, I tried to add the someeofficial tag to an existing post earlier and it didn't work for some reason.

If you post from somee.blog, it'll automatically be eligible for earnings and you won't have to worry about adding tags. And you can still cross-post to other tags like leofinance etc, just like with any other hive front end.