Pinnacle Studio Pro is quirky and it tends to crash quite a bit when doing a larger video (possibly a memory issue) aside from that it has some very nice features that I have not found in other video editing apps. You can use Ken Burns effects for both video and photos, and I like that -unlike iMovie- you can place and entire photo in frame even if the aspect ratio does not match instead of being forced to fill the entire frame. The ability to trim video frame by frame is a big plus for me. It allows me to create very accurate cut scenes and crossovers. The multitrack audio is nice but there appear to be limited options for mixing and audio cross fades. Overall this is the most feature rich video editor I have used on the iPad.
MADrewry about Pinnacle Studio Pro, v5.5.1