Dont get me wrong. I do like this app, but when you apply a composite filter and you end up not liking the outcome, there is no UNDO BUTTON. You have to import the whole video or picture all over again and start from scratch. This is a MUST HAVE feature for this app. Theres nothing worse than taking a while to create something and then make an error judgement and have to start all over. Another feature that would make this a killer app is to allow you to color or apply some effects to individual frames in a video clip. For example; editing a video and making it black and white in the beginning and gradually fade it into color or anything else. Maybe take an individual item in the black and white film and make that just turn into color. Im not sure if this is possible but it would be a hugh marketing aspect, since this feature is not yet available on any photo application within he app store.