I was using artio 1.0.x and placed 6th with my most essential keyword, after upgrading to 2.x Google dropped me to place 68 or so...

Bump!

What happens is Google recognizes these Meta Tag ads as spam and penalizes your site. For a product that is supposed to help with SEO, it actually destroys any SEO you have done.
You are better of not doing anything to your url'S then adding this, as the spam far outweighs the delivery from a Google viewpoint. Had a site go from #2 in a Google search to the third page two weeks after installing this. Took a lot of work to get it back to even the 1st page. Avoid at all costs!