I just bought GSX Pro and I am 95% GA. I have got it to work ok but sadly you end up having to delete Stairs, Loading equipment and other airliner type equip, there are also no passengers as you haven't got stairs... which is disappointing. What you do get is great scenery at larger airports lots of vehicles and I love the Follow me vehicle. What you also get as a GA Pilot is a pushback so when I am flying twins Baron or my C310 or my Kodiak it is quite immersive. (You don't need a push back for a C152 as you can do that by hand) LOL. You have to position all the tugs and marshallers and catering and GPU once. But when that is done it remembers all the positions for next time you go up. You get random male and female marshaller's too which is nice Plus you get all the RT from the marshaller etc inserting the Bypass keys and telling you to take Parking brake off or telling you off for releasing it when you should not etc.
Is it worth it?? IMHO Not at the moment for GA flying anyway, if you are thinking of dipping your toes in to the Airliners scene then yes it looks amazing. I am holding out hope that they develop something within the program for us mortals that just fly GA, maybe one day fingers crossed. I am still learning it all at the moment so I might discover other things I can do for my GA flying experience.