I have tried a few blades on my Specter V2 NME- VTX 717, Spinblades 720, RotorTech Ultimate 715, and MSComposit Rapid 700’s… all of those blades have a very different feel and reaction to that airframe. I never tried the AZ 715 originals so I can’t compare them to that- but I can say that these blades provide a good amount of stability around center stick and a really good feeling when trying technical maneuvers at higher rpm. This blade feels a little more forgiving if your collective management skills aren’t perfect. These blades start to feel good at 2100rpm+, for lower/medium head speeds (1650-2000rpm) I prefer the RotorTech Ultimate 715 or Spinblades 720’s. Autorotation hang time seems a little better on the other blades I’ve flown, but these aren’t bad. There was a splotch of glitter on one of the blades in the set I got, seems like it should have been a B Surface blade. I haven’t weighed them yet but I believe they may be as light as some 700mm size blades, which may make them a decent blade for nitro heli’s as well.