I just redid my brothers 200w flex panels, the first set of unknown brand lasted 1yr. The Renogy's seemed well made, all layers bonded well together and a textured clear top surface. Cut off the old MC4 pigtails and butt connected to new panels to extend short pigtails. Eternabond double sided tape to sick down over old panels. 6+ amps from both. Time will tell if they last.