At this point I would have to recommend that you stay away from Dolphin. I have a Dolphin Dynamic that worked marvelously well for almost 2 years, then stopped. Then I discovered how rotten and atrocious their service is. Maytronics doesn't service them. In the US, SmartPools is the service agent for Maytronics and they are incompetent and think people will just go away when they don't fix the units. I have been struggling when SmartPools for 2 months now.
In addition, people are finding that new Dynamics are not working right out of the box.
I finally broke down and bought a Blue Diamond (B/D). It has its issues (such as I have to remove the ladder before I run it) but it is FAR better than the Dolphin was in pure cleaning power. That's saying a lot because the Dolphin, when it ran, was darned good.
The Pentair 730 looks a lot like the B/D DaVinci but with different plastic on top. The brushes are the same blue foam, and the cart looks the same. Even the performance specs are VERY similar. I suspect they may have come from the same plant, but that's a guess. Pentair has a good rep, but to have no more than a 1 year warranty seems flimsy. The B/D has a much longer warranty.
That doesn't mean you should by the B/D and not buy the Pentair. Look, also, at AquaBot and Tiger Shark.
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