I had the misfortune of damage to my lower seal because of some fishing line. Unfortunately, the line was not discovered until after the lower unit was extensively damaged from water intrusion. Formula Boats of Missouri offered the SEI product as an alternative to the OEM part. Between the difference in price and the three year warranty, selection of the SEI lower unit became an easy decision. Based on all my research, I am confident the drive will perform well once the break-in period has been completed.