Thanks for so usefull software.
GUI looks cool and I can imagine that if it work than it's quite useful app. But at this moment it doesn't work at all on Ubuntu 13.04. Any attempt to render video finishes with error message :-( I use version from Ubuntu Software Center (photofilmstrip 1.9.91+dfsg-1). If you need any additional info about this bug than feel free to contact me.
There are no 4 star reviews.