Two out of three were "successful" for us; and actually the third worked out "successfully" for everyone involved, especially the child. It just worked out some where else. Our two came to us at 2 1/2 and 5 years. Nine years later the (then 2 1/2 year old and now 11) is an awesome guy and great family member. Our (then 5 year old, now ten year old daughter) is doing very well also. She does all the "normal" stuff. Is in regular activities, classes and peer relationships. Her challenges were and are considerable. She will always have her issues, and they do not get in the way of her success in life and our satisfaction as parents.
We are all content with the way things worked out for us. Best Wishes.