The system is only bout 5 months old. And im assuming when u say how do they work u mean how do they sound and perform? If so, this system put's out alot of bass. They settings on the amp are only set bout half way and it's enough for me. With these setting and my headunit volume on bout 18 i can make my neighbors houses vibrate. Thats the only way i can describe them to u. Everything is in working order. You won't have to worry bout that. My cuz who is goin to be with me can vouch that they do work. If u have anymore questions feel free to ask.