Polaris 9550 Sport
#14 in CordedFull review
A heavy-duty corded Polaris for large in-ground pools, if you can find it from a reliable seller.
Walmart $999$999
The Polaris 9550 Sport is the better robotic pool cleaner overall, rated 3.6 to 3.2. The Polaris 9550 Sport leads on cleaning. The Polaris 9550 Sport costs $80 less ($999 vs $1,079).
Dolphin Cayman
#27 in CordedFull review
A scheduled floor-and-wall robot for mid-size pools, sold through dealers.
Pool Express $1,079$1,079
Prices were last checked October 21, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Polaris 9550 Sport for cleaning (Floor, walls and waterline vs Floor and walls).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every corded robotic pool cleaner; a clear win is highlighted. How we rank explains each one.
| Factor weight | Polaris 9550 Sport | Dolphin Cayman |
|---|---|---|
| Overall rating | 3.6/5 | 3.2/5 |
| Value 25% | 40 $999 | 36 $1,079 |
| Cleaning 25% | 85 Floor, walls and waterline | 60 Floor and walls |
| Navigation 15% | 50 Sensor-based | 50 Smart scanning |
| Warranty 15% | 50 warranty not published (neutral score used) | 50 2-year warranty |
| Pool size 10% | 50 pool size not published (neutral score used) | 56 pools up to 40 ft long (about 800 sq ft) |
| Features 10% | 75 3 of 4; no app control | 33 1 of 3; no app control, swivel cable |
Specifications
| Polaris 9550 Sport | Dolphin Cayman | |
|---|---|---|
| Pool | ||
| Pool size (rated) | - | Up to 40 ft long |
| Pool types | In-ground | In-ground and above-ground |
| Cleaning | ||
| Cleans | Floor, walls and waterline | Floor and walls |
| Surface skimming | No | No |
| Filter | 5 L canister with dirty-canister indicator | Fine Filter Kit, top access |
| Filter capacity | 5 L | - |
| Water flow | - | 4,000 gal/h |
| Power | ||
| Power | Corded, 70 ft cable | Corded |
| Run time | - | Longest cycle 2 h |
| Swivel cable | Yes | No |
| Navigation & app | ||
| Navigation | Sensor-based | Smart scanning |
| App | No | No |
| Scheduling | Yes | Yes |
| Retrieval | Easy Lift System | - |
| Caddy included | Yes | - |
| Build | ||
| Weight | - | 14.6 lb (6.6 kg) |
| Warranty | - | 2 years |