Converted the sport fb to fbl with BX. Flew it today and it was awesome. More agile, responsive, and steady than my 450 Pro. Not sure if it's the DFC or the BX that makes such a difference with flight characteristics. I am going to convert my Pro from 3GX to BX and assess the difference. The BX locks the tail in solid and the DFC seems to make her more agile. I realize there are many factors beyond my scope particularly with subtle fbl programming. However, I really enjoyed the Sport today and wanted to share.