First of alle: Thanks for your nice plugin.
I use the plugin on my blog http://www.column-razenberg.nl . Most posts have a length of max 350 words. I wanted to show the whole post in the search results so I set the length of the snippet on 500 words. Now I can see the whole post but every post in the search results begins and ends with '...' This suggests that the post is longer than what you see.
Suggestion: Is it possible to show '...' only when the tekst is longer than the length of the snippet?