All in One SEO Pack Importer

Imports SEO data from Thesis to All in One SEO Pack. This is useful if

• You are leaving Thesis for a different theme or
• You prefer the superior SEO of All in One SEO Pack
• You know that postmeta is best handled by plugins rather than by themes

Install using FTP or the built in plugin installer.

1. 

   Simple UI (or jpg, jpeg, gif).

Should I use All in One SEO Pack over a theme’s built in SEO meta functionality

Yes. The fact that you’re looking at this plugin shows you that when post meta is stored by a theme, you lose it should you ever decide to switch themes.
With a plugin, you can switch themes whenever you want and not worry about losing any post meta SEO functionality.