Echo pretty much everything Andrew (Tijuana Taxi) wrote.
I tried the Glide Free system at Lake Conroe earlier this year. Am certainly no foiling expert, and we didn't have very steady wind that day, but getting the Aero up and out of the water was really fun! I wanted to stay out longer to keep learning, but others were in line to give it a go. As almost anyone who's learning how to foil will attest, it's exhausting at first, but one gets the hang of it with repeated practice.
As you wrote, it would be nice if the foils weren't so expensive. Understand there's a lot of engineering and precision manufacturing in the kit, and if one compares the cost of it to, say, just one foil of a Moth it seems more reasonable. Nice that the kit can be adapted to other boats as well.
I don't think a different dolly is necessary. Seem to recall launching off a Dynamic Dolly no problem.
Do keep in mind the boat wasn't engineered to foil, and the system isn't officially sanctioned by RS. One risks voiding warranty by using it.
That said, wish I could afford a set for my boat!
Marc Jacobi