All true except that you really need to look at the lifetime costs of each solution and not just the energy savings. While the Intelliflo does better for energy usage, the cost premium, interface panels and/or controllers can make the 10 year cost higher for the Intelliflo than a 2 speed. So it really depends on the situation. Of course if you are only worried about carbon credits, then the Intelliflo is certainly the most ecological solution.