I live in Canada. All local dealers I have been to sell either the Hayward AquaVac or the Hayward TigerShark QC. How good are these units?

How do they compare to Aquabot or Blue Diamond cleaners? None of these seem to be available in Canada.

Costco sell the iRobot Verro 500. Is this the same as the Blue Diamond?

Is the Blue Diamond the same as the Aquabot Bravo?