regarding SEO, this is one of the testimonials a Flexx user left in the members forum:
Essence is using very particular graphics and it will not be easy to recreate that in Flexx, but it can be done (as in, anything can be done depending on your graphical design, php, css, html and WordPress skills). But spending (probably) hours and hours to achieve that may also justify the purchase of Essence theme.
Thanks Guys I can tell you my traffic has increased 2 fold in just this short time not to mention my income from these sites is jumped up also. As for xsite pro it is a thing of the past. The more I work with the flexx themes the easier it gets. I can knock out a site faster then xs pro and that includes designing the graphics. The ease of use and the better seo factor has got me sold. Time to convert my other 30+ sites Thanks
We have not had any reports of incompatibility with the sidebar navigation plugin.
Hope this helps,Ronald