I was thinking it would be nice to have a separate S3D controller & preview app for a nice full-graphics controller. I intend to keep using a laptop & desktop for the actual slicing because of the slicing speed and use an SD card from the tablet. I wouldn't mind paying for an app, but preferably without having to spend the full $140 for another license with the slicer.
Edit: $150! Seems like it was a stealth price increase.