I'm a newsblur user but it is in no way a placement for reader. For one newsblur will only track the last 30 days of posts (or is it 30 news posts).

So for example in reader I might add site like Unity's blog. Reader would show the entire history as unread. I could then slowly go through all the old tutorials since they're all there. Newsblur I can't do that. It won't pull in stuff past a certain date/count.

That also means I can't just put some feeds on "low burn" mode where I keep them but only check them very seldom because the unread stuff will slide off of newsblur's limited post queue