Can you easily get books in?
Nope. There's an import feature, but it appears to be broken. There was no response to my please-help email.
The import feature is tricky to to locate (Settings -> Goodreads History Import).
Riffle import accepts a GoodReads .csv file. The import runs in the background, and you get an email when it completes.
It says "the books will start to appear momentarily, though the import can take up to 24 hours."
After 5 minutes, no books had appeared. I tried the .csv upload again, and it restarted (I think.) I wondered if this would create duplicates.
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Can you easily get books out?
Unknown.
Without an import, it's hard to evaluate this.
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Can you organize your books?
Unknown.
Without an import, it's hard to evaluate this.
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Does it tell you when your friends add a book, or finish one?
Unknown
Nope.
Riffle General impressions
Riffle doesn't meet the functionality bar to be a replacement for GoodReads. If they fix the import issue, I'll re-evaluate.