I just did a quick run-through of the manual, and I'm not sure I'll be using this. The Virtual Fence and 3D Map Area are interesting, but I don't have any immediate needs for this. The Waypoint mode is big step up from what you can do in Go4, but it's far less capable than Litchi wrt options/settings. No POI's for example, which are a big plus for Litchi. Given that I know Litchi well, and it already supports all 3 of my drones, I don't see that the investment in learning GSPro will be worth it. Pretty good for free, though, and I will certainly keep it on my iPad in case a need arises.