arterial switch

Our daughter had the arterial switch in March of 2004 by Dr. Spray at Children's Hospital.  Her diagnosis was double outlet right ventricle with a vsd and coarctation of aorta. She also has a single coronary artery. She has done very well and is an active 5 year old girl. I was wondering what the data has shown regarding late complications. We have always been told that the surgery is new and there isn't alot of data on the kids who have had the switch. But some of the patients must be 15 to 20 years old by now.... just curious.   John