I started using DJI GS Pro last night. Their documentation stinks at best. Software does a great job but lacks some of the nice options Litchi has built in. It took me a while to figure out how to do a few things but once I got it up and flying I was very happy with the result. I do wish that it logged your flights like DJI Go so all your info is stored in one place.
All that said I am tempted to buy Litchi for a few reasons.
1. Mapping on Computer, it 100 times better than working on an Ipad Screen.
2. Options that I can set for each way point like, pausing, take picture, pause then start recording....
3. $22.99 will more than pay for itself in time of building routes.
I would suggest building a couple routes in DJI GS Pro and then log on to
Mission Hub - Litchi and create a route. The differences are painfully obvious. I could create 5 detailed routes on Litchi while dinking with one in DJI GS Pro. You spent a lot of money on a Drone......$22.99 is a small price to pay just to enjoy the overall experience.