William,
BANS is a tool for helping you create an eBay affiliate site in any niche you can imagine. As long as eBay has a category for it, you can build it.
BANS will generate pages for you that are arranged according to different subheaders within the category. You can customize the layout of the sites, the meta information, etc. You can also create other non-product pages within your site.
While it is a useful tool, there is still customization that needs to be done to differentiate your site from all the others out there. Personally, I like to use BANS as an add on to a WP blog, for example.
There is a lot of information you can learn from the BANS forum though I'm not sure if all the sections are accessible unless you're a customer.
Hope this helps.
Hock