I've had the same string on my bow- my whole bow hunting career (about 2 years now). It looks good to me , it shoots well . How do I know when to get a new one ? I don't want to be cynical , but anytime someone says that you need somthing after a specific amount of time , I figure theyre trying to make a buck . Are there sighns ? Or should I get it switched out every year ? Thanks .