To Smore or Not to Smore?

That is the Question

David's attempt to answer Julie's Expert Adviser discussion question

I only had a chance to skim the discussion about why you are inclined to switch from ebooks to a something like smore. I just created a Smore account. It does seem easy to use. Have you considered (and rejected) other such software like learnist, or haikudeck?

What made you decide not to go with a "true" ebook? Are you familiar with calibre?