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The CircuPool and CompuPool units are very similar, but the CompuPool is less expensive (also shorter warranty) so most people go for the CompuPool instead of the CircuPool.
The CircuPool warranty is not nearly as good as it might sound at first. Look into the details, it doesn't cover as much as you might imagine that it does. It only covers replacement parts, not labor, and the percentage covered declines each year. For comparison, Hayward is three years parts and labor and AutoPilot is two years parts and labor, both 100% coverage.