Dolphin Sigma Robotic Pool Cleaner with Wi-Fi, Gyroscope, and Massive Top-Load Cartridge Ultra-Fine and Standard Filters, Ideal for Pools up to 50 Feet

My pool was built 3 years ago and it came with a Pentair robot (not sure if this is a rebranded Dolphin, but I think it might be), and it has done ok, but finally just quit working entirely. The warranty was expired by 5 months, so I had to get a new one. I have had an old Roomba house vacuum, and if you've had one you know they just wander around aimlessly and they miss a lot of the floors. Then I got a newer robot home vacuum that maps out the house, and the difference was enormous. The new one does an excellent job, while the old one was just ok. That is the same difference between the pool robot that came with my pool versus the Dolphin Sigma. This thing is not just wandering around, it knows where it's been and it knows where it still needs to go. Not only that, but it scrubs the tile line, which the cheaper ones do not, and that is really important. I love that the app can schedule which days you want to clean and what time, and it notifies you when it finishes cleaning. I use the fine filters, and they always pick up a lot. When this thing finishes running, my pool looks great. I never need to sweep with this thing. It does it for me. It's not cheap, but it's the best. All the reviews I read pointed toward this one being the clear winner, the only exception is if you have a lot of leaves, the Premier might be better because it has a large bag to hold leaves. But I have no trees in my yard, so I get pine needles from the neighbors trees and whatever the wind blows in. But I didn't need the extra leaf storage, so I went with the Sigma. Also I don't think the Premier has wifi or an app. Anyway, if you are on the fence but you want the best pool vac on the market today, go for it. You won't be disappointed.

I bought the Dolphin Sigma in 2023 and it feels like it has been in the shop as much as the pool. It initially started out okay with quick and easy setup. Cleaning was adequate if not exceptional. Unfortunately, started to have issues with loss of power to the machine. You can forget about talking to anyone to assist and any response you get will be over emails. It had to be sent in for repairs and Maytronics requires the buyer to pay for shipping, which is north of $100. Also, this process will take at least two weeks. Reportedly was the cable. It worked for a few months and then exact same issue. It went pack to the shop for repairs. This time reportedly was the power supply box. It again worked for a few months and again stopped working. This time it thinks it is out of the pool despite it is not. I have emailed/submitted report to Maytronics but as of this writing still no response. I'm done with this machine. The expensive, lack of support and only adequate cleaning is not worth the hassle. Save yourself the headaches.

This isn't a cheap product by any means, so my expectations were pretty high. I previously had an AquaBot Elite for the last 3 years, which worked pretty well until one of the motors decided to stop working...conveniently just as the warranty expired. Don't get me wrong, the AB Elite was overall a good product...but this Sigma seems far superior. While I'm only 1 week into my ownership of the Sigma, it's noticeably better than my AB Elite in: 1. Suction power - My AB Elite would tend to skip around the pool floor when it stopped and started (or turned) because its suction wasn't powerful enough compared to its drive motor. The Sigma never loses contact with the pool floor. And, I see it sucking more debris into itself that's not directly in its path...something I didn't notice much with the AB Elite. 2. Getting stuck - I haven't seen the Sigma get stuck once yet. It put itself into a strange position on my pool steps where I was sure it would "turtle" on its back and I'd have to reset it. Nope! It corrected itself very quickly. My AB Elite would often struggle and get stuck at inside and outside corners of my pool wall and floor. It would take up to 10 minutes to correct itself, just sitting there spinning. Because the Sigma has 4 independent spinning brushes that allow it to turn in a full circle, it easily maneuvers and climbs walls at any angle. 3. Brushing the waterline - The Sigma is very impressive here as compared to my AB Elite. When it climbs and cleans the waterline, it typically goes 3-4 feet in one direction (and sometimes back again). It's very thorough. My AB Elite seemed to get lazy here and in some cycles, I noticed it didn't clean the waterline much at all. I'll be interested to see if the Sigma continues this same output over time. 4. Remote control - I didn't have remote with my AB Elite...because I didn't purchase that function. With the Sigma, the Remote App works pretty well. Like others have said, you do have to stand close to the power supply box because the Bluetooth isn't very strong. It also takes a little getting used to as there is a bit of lag between your input and response from the machine. But, overall, it's a cool feature for a quick spot clean. 5. Filters - I first ran the Sigma with the pre-installed "normal" mesh filters because I had some leaves and larger debris. Within the first 2.5 hr cycle, my pool was spotless. I then decided to run a second cycle immediately after with the Ultra Fine (corrugated) filters to see what else the Sigma would pick up. It was very impressive how much fine particles were trapped. I can see how normal maintenance with these filters can save you on chemicals. I really don't have any criticism of the Dolphin Sigma at this time. It seems like a great product and I highly recommend it to anyone looking for a robotic pool cleaner. I did a ton of research before buying and am always skeptical of these cleaners because there are so many variations out there, and every manufacturer has many options.