I too am using Magic SEO Urls. the URLS themselves are going to be slightly better for SEO. To me, that is worth the money, even if it is only a slight boost.

my only gripe with Magic SEO is that the "buy now" button on my site no longer works after installing it. i have unfortunately had to remove it and just go with the "more info" link.

response from developer: "make sure you have cookies enable"

perhaps that most useless response ever.

The button works just fine when Magic SEO is uninstalled.

There is also sitemap add-on, but the documentation is nothing short of useless.