Can you easily get books in?
Yes, and it's great.
BookDigits' import accepts a GoodReads .csv file, and has clear instructions for anyone who hasn't created such a file before.
The import shows a preview of all records to be imported, and a beautiful progress bar:
It imported all but THREE of the items in my file - even the ones with no ISBNs!
All fields were mapped automatically.
Other book sites take note - this is the gold standard for file import. Damn near magical.
Can you easily get books out?
Yep. There's a .csv export option.
Can you organize your books?
Yes, there's a screen that lists all your books.
To mark a book as read, you have to rate it.
BookDigits' rating system is comprehensive
Accdictiveness? Movie Potential?
Fortunately, you can skip the deep-analysis ratings, and just use the 1-5 scale. But you must rate a book to mark it as read. Can't just fill in the completed date.
Unfortunately, you cannot search within your books.
Does it tell you when your friends add a book, or finish one?
No. You can't even add friends inside the application.
BookDigits General impressions
BookDigits honestly has a lot going for it. The import is just stellar, really.
Unfortunately, anyone expecting a social reading experience won't find it here.