This is a terrific plugin that can handle functions you might normally need 2-3 plugins for (sharing buttons, open graph tags, SEO). It loads quickly and doesn't bloat the page, which is important to me.
I had one minor issue with it, and the developer worked with me consistently, even over the weekend, until it was fixed, and released an update almost instantly.
I've tried several other plugins both for putting sharing buttons on my posts, adding open graph tags and/or optimizing my SEO - this is the most configurable and quickest-loading one out there, and while some will still want yo use their favorite SEO plugin with it, I don't consider that necessary. For me, this one plugin replaces three plugins, and does a better job than all the rest.