Well, I reached the end of GF 1 & 2....twice. Yet I'm still uncertain whether I'll ever really "finish" them. There's a whole lot of technical and theoretical material that I'm still trying to master by revisiting certain of the lessons in each course. And as far as the "play along with the instructor to a backing track" lessons go, it will likely be years before I can match the target rate at which the instructors play those songs and riffs. For me, that's pretty much par for the course for most of the tutorials that I've ventured to undertake on this site.
So, I'll have to get back to you when and if I ever truly finish those courses ;)
Nicolai