I agree here. Yes they may be smoother, faster etc but are you willing to be losing money each year on trade in's? This means alot to some peopleothers it does not. Personal preference i guess. Any club will do it. How often you want to buy a new set of clubs is up to you. My bow is probably over 10 years old, still works just fine and I will keep shooting it because i cannot justify buying a new one at the moment. No set time when u have to upgrade or if you have to upgrade at all.