dis-/advantages of installing the sitemap generator plugin

Hi,
I run a board with indexed sites (Google: about 7200, Yahoo!: about 4100)

vBSEO runs since a few months, but I did not have the sitemap generator installed.

Some of my friends say that they made the experience, that the searchengines may drop the indexed sites and after that re-index them ... whereas that can take some time.

So I want to ask you for help. Almost all of the "power users" of this board recommend the installation of this plugin, I know . I want to discuss the installation, anyway, so that I get maximum optimization for my board.

What are the advantages and disadvantages of installing?
Thank you for your answers.

Regards,
Ben.

When you install vBSEO Google/Yahoo Sitemap Creator , you'll have the ability to create daily sitemaps. You can submit the sitemaps to Google Webmasters account so Google can track your site daily from your sitemaps and update your index according to your sitemaps.

Originally Posted by Mert Gökçeimam

so Google can track your site daily from your sitemaps and update your index according to your sitemaps.

That sound good. Very good.