I did RoboSub for 4 years (probably the best thing a student can do to become a better engineer. That's another story for another day). The only issue with the

I did RoboSub for 4 years (probably the best thing a student can do to become a better engineer. That's another story for another day). The only issue with the SeaBotix thrusters is that you have to take off a screw and inject grease into them every year or so. No indication of how BlueRobotics' thruster actually fixes this problem other than the fact that they claim they fixed it.