"A cheap, cordless floor vacuum for small pools, and not much more."
The advertised '3X HyperPower' is marketing for a basic three-motor system that moves up to 50 gallons of water per minute. This is adequate for light debris on a flat surface, not a deep clean.
This is for owners of small (under 850 sq.ft.), flat-bottom, above-ground pools who view manual vacuuming as a major chore. It's a low-cost entry into robotic cleaning, provided you have very low expectations for durability and performance.
Anyone with an in-ground pool, a pool with sloped floors, or those who need to clean fine sediment should avoid this. If you expect a device to last more than two seasons or to clean walls, your budget needs to start around $400.