It depends on what the feed publishes.
If the feed is excerpts that's all anyone can get from the feed.
If the feed is full content, you can get the full content.
There is debate over which is best and I guess it depends on the target audience and what you care about.
If you don't want your content to appear on other places (eg. splogs) then you could try excerpts.
If you think one way or the other might benefit your readership or traffic, try that.
How is it done? Well, in WordPress anyway, there's a setting for Full Content or Excerpts, easy as that once you know where it is.
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