Hopefully you found the first Sherm Cohen tutorial helpful. He's an experienced storyboard artist who seems enthusiastic about using Storyboard Pro. I think that's a strong endorsement for this software.
And now that I've upgraded my MacBook from 2GB to 6GB of RAM, things are flying! Particularly, I can now scrub through the animatic and see how things flow without having to take the time to export to a Quicktime movie. I still like to do the export to see how things move at the proper frame rate, but it's helpful to have the option to take a quick look. Before the upgrade, I would get the pinwheel of death every time I tried to scrub. No more of that!
Cohen's tutorial for pans is here. Below is the current opening pan in my animatic.