Just thought I would post to share my recent experience with Maytronics. I have a dolphin nautilus CC plus robot which works great at cleaning the pool we bought it from Amazon and have had it right around a year now. I never bothered registering it or anything. The other day I put the robot in the pool and plugged it in. When I went to turn it on, it wouldn’t work at all, it was dead. So I called Maytronics technical support. The first thing they asked for was the units serial number so I pulled the unit out of the pool and gave them the number. They told me it’s still under warranty and they suspect the power supply is going bad. They then asked for my name and address and shipped me a new one which I got in two days from Fed Ex. I can’t really remember the last time I experienced customer service like that... I would recommend their cleaners to anyone based on my experience.