I'm testing this plugin on a couple of live sites. The setting wizard and configuration part is quite easy and straight-forward but I have found a few issues while using it.
#1. It's omitting focus keywords in meta description and showing focus kw isn't present in the content
#2. Content analysis is not up to the mark. It does not respond in the real time. Minor problems like random Word count, representing there's no headings/styling etc.
#3. Average SEO score is not available on the post page.( bad/ok/good/excellent)
#4. Link analysis is not perfect. Not showing nofollow links/total link count wrong
There are many good points, still, it's behind Yoast's latest version for me.