to my mind, there's no point offering an RSS feed without the backlinks, because that is the whole point of doing it... it's supposed to be an interesting taster of what's on your site, to tempt the people to visit.
if the scraper knows what he's doing then he'll just strip the links out anyway, which is easy enough to do, but that is no reason not to include them.
the only SEO concern that i'd worry about is providing a load of duplicate content. but i always make sure that the snippet on the feed is totally unique. i dont duplicate the text that is already on my site.