and it's not a big 'but', but it's a but - I can't close the case on my GoProfessional Phantom case with the new props on! Crap. They're self-tightening and easy enough to remove and put back on, just a minor annoyance / surprise. So far flying impressions are that it's definitely snappier, and elevates more quickly. My thought was to offset the weight and dynamics change of the gimbal with the new props. Seems to do that, so I'm pleased. Also 'felt' like there was less wobble when dropping the craft. I haven't messed with any gains yet, and it all seems good.