I concur that opting for a 7-8 cm increase in femurs offers the best cost-effectiveness and is likely the most prudent choice for the majority. Despite potentially experiencing a slight decrease in sprinting ability, the ability to perform tasks remains unchanged. According to my recollection, Dr. Rozbruch mentioned in an interview with Cyborg4life that 80% of patients were content with a 7-8 cm increase in femur length.