Looks to me as though it makes your posts unique by adding a bunch of gibberish in between your words that only the spiders see? I could be wrong, but that's the way I'm taking it in. If that is the case, I'm sure Google will catch on eventually, and I'm positive this will be looked upon as a form of cloaking, and even more positive you can all your efforts goodbye come the time. It does not appear to be a simple word/phrase replacement tool.
if they are just dropping random character strings in between words and whatnot, i'm sure that is dilutes the textual content of the site. However those using this plugin, I don't see putting a ton of time into on page SSEO, so whatever. I'm sure it's better than straight up duplicate content.
Looks alright for short term shady operations, not so good for long term term seo.
