I've been using it for the past few weeks on the web series I'm shooting.
I can't really compare the free and the pro versions, because I bought the pro version almost immediately. (I was pretty impressed.
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It definitely helps in planning and visualizing your shots, forcing you to think through them completely.
The ability to import a background picture for the scene is a great feature. Since my web series is going to use the same locations often, I created scaled floor plans that were easily integrated.
Also the ability to sync scenes using DropBox is handy. Since I know the locations well, I block most of my shots on my desktop then sync them to my tablet for use on set.
There are a couple of things I didn't like.
You can have multiple shots within the scene, of course. Each shot gets its own camera icon, and has actor icons associated with it. This can lead to a messy diagram, especially in tight quarters. It's not much of a problem when playing back the animation, because only the icons associated with each particular shot are displayed.
But when trying to edit the diagram, it can be difficult selecting the correct icon if two icons are closely spaced. I can sympathize with the developers, since they designed it for touch screens and had to give up accuracy for ease of use. But when using it on a desktop, the mouse pointer can obviously be on one icon and a nearby icon is selected instead.
And it's also a problem when outputting the shot list for printing. Since no one else on my production was using the app, I was hoping to export each scene to a PDF and email or print them for the rest of the crew and cast. But the PDF export just contains one image of the diagram at the top, and with multiple shots in a small room it was just a jumbled mess. It would be better if there were multiple images of the diagram, one for each shot, containing just the associated icons. But I guess you could work around this, using one shot per scene.
I also wish they had a field of view preview, a shaded triangular area that moves with the camera, sized based on camera used and lens length. Doesn't seem like that would be difficult, other than gathering the necessary data for cameras/lenses.
But all in all, it's a really good app that they seem to be improving constantly. And it will totally rock once they implement the planned 3D rendering and script integration.