Wordprss SEO is a slick concept and for the most part, it's a nice plugin. However, my main problem is the homepage titles and etc that yoast does not do a good job at. I've never experienced a plugin that would duplicate the page titles and descriptions out the box. The fact that I have to edit my themes core files is a pain in the but for everytime my theme gets an update. I have to go searching for the edits to redo. Also, taglines seem to be forgotten about in this script for reasons unknown. Sitemap issues for the upgrades after 1.1.9 have went to hell in a basket on my site.
As I said above, it's a cool plugin for a vanilla site and has great potential, but it looks like I will have to fall back to Head2Space until this plugin is not so cranky with my site.