I buy a new one when I want a new one most of the time. Usually it is about every 4 years or so for my compounds. But now that I have gotten back to shooting a recurve once again I have found that I buy a new recurve more often. I really like my Check-Mate Hunter II and don't see anything replacing that in the near future. The only upgrades I see doing to her may be an heavier (Hunting) and lighter (target) sets of limbs for her.