Very pleased with the performance of the new controller. On a 2014 RXV with no other changes and with 215/40-12 tires I went from 21mph to 27mph. Only complaint is the wiring mess, wish I knew about or was told about the TAC2 model which is an exact copy shape wise to the Curtis controller and would then use the same mounting bracket. The TAC1 mounts to the floor and takes most of the space needed for all the wiring; could be neater in that regards. Otherwise very happy with the Navitas 600A.