I have a Dolphin Explorer E30 and am satisfied with its performance. I do not see a reason to pay more! On sale, it was twice as cheap as Sigma and Supreme. It cleans waterlines, floors, and walls. It has only one cleaning cycle, but it is equipped with an extra-large filter basket. I control it with my smartphone. If you find dust and want a gyroscope, then it makes sense to choose between these models.

I have had Dolphin Nautilus CC Supreme for half a year. It is my first robot cleaner; before that, I had a suction-side automatic model. I do not understand why I have waited so long to purchase it; I forgot about the dirty pool!

I consider Dolphin Sigma a theft! It did not last the warranty! I had to repair and replace the motor. I did not pay for the repair, but I had to clean the pool manually for two weeks. I would prefer not to experience that.

No matter what you buy, you will be glad with the cleaning performance. Did you see the reviews? Considering the high price, the satisfaction rate of both models is quite good. Dolphin Nautilus CC Supreme is the #1 Bestseller on Amazon, and Maytronics considers this model the Best Performance. But I personally bought Sigma at a large discount. No bad reviews from my side.

Dolphin Sigma and Nautilus CC Supreme are both designed for cleaning walls, waterlines, and floors of all pools up to 50 ft of any shape, so they are both good for your pool. Nautilus Sigma has brushes – in front and back, while Nautilus Supreme has an additional brush in the middle. Moreover, Nautilus CC Supreme has several cleaning cycles that you can choose from (1.5/2.5/ 3.5 hours), while Sigma only has one (2.5 hours). Only these differences impact cleaning performance. If you have a lot of debris and your pool requires a long cleaning, we recommend Nautilus Supreme. But for better navigation in the pool and fast cleaning, Dolphin Sigma is recommended.