That's the part that concerns me. I'm losing the visitor to the feeds. I'm not too sure I feel 100% comfortable with that. I lose all that data associated with the visit which from my perspective may be a little more important than the feed. Ya, I know, just do it and find out. ;)
I don't use my reader as much as I should I guess. I prefer the old fashioned way of bookmarking, keeping a page of resources, etc., that I can easily follow links from. I like browsing websites and not a list of headlines and descriptions. But I'm learning, so as I get the hang of this, I'll probably feel a bit more comfortable with it all.
I just don't like the idea of losing potential traffic to the site. There are all sorts of things occurring when that visitor gets to the site. You've got the visual, core content and promotional stuff that they don't get via the feed. Ya, I know, I can do quite a bit with that feed to give it some dynamics, some interactivity.
I have a feeling this could have a negative impact on the traffic analytics portion. But, if I'm using GA and FeedBurner, I'm almost certain they can tie the two together and see; "Oh, the site implemented feeds hence the reason for the drop in traffic. Take the two stats and combine them for traffic analysis." Ya, I know, me Tin Hat is beaming right now.
For those of you using Feeds, what namespaces are you using and which elements within that namespace? Do all of your feeds validate? I can tell you that of the top ten blogs I visit, there were more than a few that did not validate.