Did AW/Leonardo plagarise, or ask permission to use?
AW also do the BEST static balance job on their rotor blades. I don't know what they use for blade static balancing or how they do it, but they do a damn fine job of it. As do RBI (or whatever they're called now) as they also repair and balance AW139 blades.
Those blades will easily fly on any 139. The worst I've had is a botched job that took a couple of flights to figure out that the inboard and outboard tabs were in opposite directions!
Took Pitch Links and Tabs to nominal, emptied out all the weight and had it below 0.1 IPS from FPOG to VNE in three flights. The third flight was to confirm that HUMS was actually correct with the prediction.
That has to have something to do with how well the static is done.
I'm not going to comment on 500's. I used to try and avoid them as much as possible!
Cheers.