The term "optimized mirror pages" might be something to be concerned about. The way a SiteMatch Xchange feed works is the reseller of the service will work with you to create a data feed to send to the engines.
To generate the feed you might export a copy of your database with titles, descriptions, and keyword tags as well as the visible content on the actual pages of your website. The other way is to crawl your site and automatically pull all the necessary info from it.
The contents of the data feed have to be almost identical to what is already on the website, from our experience. There is some "optimization' of the feed involved, but generally it has to be very close to what is already on your site. If the content on the site is not already optimized then feeding the same content into SiteMatch Xchange probably won't do much.
