An excellent plugin but as previous commenter mentioned it's incompatible with latest version of PHP (5.4), I would love to see a fix for this, though still I think warrants at least 4 stars.
When adding many files it sometimes hangs and doesn't complete. I think the code could be re-worked to avoid potential issues with script time-outs.
Thank though none the less, it has proved to be invaluable transferring galleries from an old site into a new one.
Paul