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Hi, I too have a volusion site, and have had my ups and downs with SEO. I was not as prepared with 301s when i switched over so i took a hit, but after 3 months went back to normal. I would say that volusion is great for seo, no need to purchase an additional package. I recently took a gamble and gave all of my products unique URLs via unique "product name short" and i dropped 50% of my traffic, bad idea. After 8 weeks of lower traffic i am now going back to having the same product name short for all produtcs in a subcategory. That was my mistake not volusion. I find that SEOMOZ + Volusion import/export is a pretty good combo to make sure that my site has all relevant info and is updated quickly.