Hi Raize,

It should have a better impact on SEO. I think of following reasons:

1.) Code-to-Text ratio increases

2.) Google Webmasters shows me that the most imortant keywords on my page are words like usernames, "comments", "startet by" or month names, which is because there is not much other content on my frontpage of the forum. When the excerpt is displayed, probably other more forum content relevant keywords should appear as they are in the text.

Greetz