Very interesting, JayVee, I've liked the handling of the earlier EFlow Nitros that were with the speed motor. Nimble, good components and less pricey than some other similar type ebikes. The brand arrived a little too early for the American public and probably would have done better had it more watt hours for the battery like the newest version you describe.
Seems to use the same 250W or 500W GO Swiss Drive motor as the Specialized Turbo. Excellent choice. With the 522Wh battery and the 250W hub should be in the Turbo or Turbo X range. With the 500W hub and 724Wh battery should be similar to the Turbo S. But that 964Wh battery with the 250W motor should allow range around 70miles (115Km).