It depends on how you want to describe success. We have been doing Floortime for over a year, and I feel like it has been extremely successful for us. Our daughter went from being engaged with us for not even two minutes at a time to now being engaged with us the majority of the time. When she has sessions with her therapists, she can keep engaged with them for the whole two hour session. I feel like Floortime hits the real deficit of autism and teaches the ability to enjoy the people you love. Our daughter still has autism, but she is "with" us instead of just stuck inside herself.