I'm using Artio JoomSEF and the Virtuemart extension on my site. This software does what it says it will do. It will generate SEF URLs from Virtuemart content and will also automatically populate MetaTags for the products. Installation was very easy. At first the software didn't work for me. Every URL on my site would produce the default web server 404 page. However, after a call to their Support staff, they helped me identify the problem. Just make sure you have "AllowOverride" set to "All" in your httpd.conf. This solved my problems. SEF URLs and MetaTags are being generated. Glad I made the purchase.