Hi,
1. Filters are available via the menu Display>Filters with the Business edition. The search plugins of HikaShop which are compatible with the search module of joomla can be configured via the joomla plugins manager.
2. Yes. Filters are only available in the Business edition.
3. Filters can be displayed either in products listings or via the hikashop filter module. For the joomla search, it be be displayed via the joomla search module (or another search module compatible) or the joomla search result page.
4. Filters only work on products. The search plugins are for products and categories.
5. Almost any field. Custom fields, characteristics, categories, price, weight, dimensions, name, etc. Filters are not available in the Essential edition.
6. HikaShop filters can only be used by HikaShop as they are very specific to HikaShop. For the joomla search, you'll indeed find plenty of modules to replace the joomla search module.
7. There is not much link to the site map as far as I can see. But yes, HikaShop supports site map with xmap:
www.hikashop.com/support/support/documen...ation-with-xmap.html
8. You can override the display if you want and of course apply the CSS you want on the elements.
9. To a certain point yes.