I agree with Ethan here. In addition to requiring an entirely different ammo, they're on the expensive side and barely, if any, more accurate than the Elite series. I REALLY hope this isn't intended to be the long-term replacement to Elites. I hope that this is the awkward teenage phase and in a couple of years we see an improved Elite type series with softer-than-off-brand wafflehead darts.
I see the problems they're trying to solve with the darts, mainly stiffer foam for fewer jams and a heavier head, shorter body, and winged tail for accuracy, but they don't seem to be delivering on the latter which I care more about than the occasional jam.
This is a good rundown. I wish he were a little more technical in the testing but the jist is there. Nerf Ultra Series | Initial Analysis