QUESTION
Is a used Fitbit Charge 5 worth it, or should I buy the Charge 6?
Used Fitbit Charge 5: about $45–$80 if it’s in good condition.
Fitbit Charge 6 (new): about $120–$160.
A used Charge 5 is worth it only if it’s at least $50–$70 cheaper than a new Charge 6 and the seller can show good battery life with no screen, sensor, or charger issues. If the used Charge 5 is priced close to the Charge 6, buy the Charge 6 instead.
Short caveat: prices move a lot, so check sold/completed listings before buying.