Splice Video Editor has a huge number of video editing tools and features, but it lacks the direction, instruction, and design needed to make it easy to use for casual users. That is not necessarily an issue for power users in need of a feature-rich iOS video editing tool, but if you are new to iOS video editing or if you are interested in something easier, this app probably won't cut it.
After you start up Splice for the first time, you can either load a video and images from your library or you can record something new. The loading feature is frustrating because it does not show screenshots for all of your albums until you go into them, so you'll be sorting through them one at a time if you don't already know what you are looking for. You can add new audio, video, and photos to the track, however, moving them around, adjusting positioning, size, cropping, and more before rendering a final video. We were very impressed with the resulting videos and render time was comparable to other free video apps, working as advertised.
The major issue with Splice is not functionality but setup and use. The interface is at times unclear, there are no Help files in the app (though there is a video on their Web site you can view), and many options are not labeled clearly, so there is a decent amount of guesswork when creating or editing a video. For those that can bypass these issues, however, Splice is a very solid free video editor.