Breadcrumb - how important
 

I am optimizing several on page aspects on my site.

But I did not implement breadcrumbs until now. How important is it to do so?

Are there any suggestions on the configuration options with respect to breadcrumbs (seperator, anchor text, prefix)?

Google has endorsed use of breadcrumbs in several of their videos. They are a helpful device for website with complex structure or hierarchy such as eCommerce sites. They not only aid user navigation but also help search engines get a clearer picture about your site's structure. For example if you're using faceted navigation you could end up on a product page that has a long URL and ambiguous placement in the site's hierarchy. Breadcumbs can aid with this. Another neat thing is in the SERPs when you get little: Top Level > Main Category > Sub Category type links under your snippet.

I would use it at the top only, it's become a bit of a standard and people know where to expect it. Referncing it twice would be just a doubleup of the same set of links.

Thank you.
I will use your suggestions. Now I have to figure out how to implement it. I suppose it's not to difficult.

Breadcrumbs is useful for google bot know about the page navigation and it useful for user to know that they landed in correct page.

Ya i do agree with the sayings of wrightandru