A friend of ours owns one.
My take: Too complicated (he couldn't even figure out how to mount the carafe on the base at first), too bulky, I don't care for plastic/acrylic carafes, and it strikes me as a cheap knock-off of a Blendtec or Vitamix type of machine. To me, it smacks of "As seen on TV" merchandise. Like, would you put a "Ninja" bike in the same class as a Harley?
Just this past weekend I saw some of these in their original boxes at a nearby Goodwill store. It appeared that Ninja had slapped labels on the boxes advising that the machines were not to be sold. I suspect they were either returned due to defects or were used as demo models, and Ninja was not going to provide any warranty coverage on them.
I'm quite happy with my kick-ass '60s Osterizer with ice-crusher blade. With the "Fusion" blade assembly installed, any multi-speed Osterizer can be elevated to Blendtec or Vitamix capabilities with just a few exceptions.