I just installed mine, but have read you can purchase most any part of the motor/pump and they are fairly easy to repair. I would hope to get a few more than 3 years out of it before replacing the motor however.
Sorry for the delay in responding everyone. I was busy with a few things. As it turns out the issue was with the electrical connection not putting out the proper power. It was addressed and the Stenner is working perfectly.
Still just as happy with it as the day I installed it. Quality addition to any trouble free pool owner's life