I'm pretty happy with my Prime, and I've had no issues at all with the 3D arm, it's great!
That said, I can't imagine moving to a Prime Signature, as I prefer the feet better on the stock Prime, as well as the wiring. I've tried the Nordost wiring on other arms, and I'm not a fan.
If I ever decide to make another move, it would be for an Avenger.
I'd like to play with multiple arms, and I don't have the real estate for a HRX.
That said, I can't imagine moving to a Prime Signature, as I prefer the feet better on the stock Prime, as well as the wiring. I've tried the Nordost wiring on other arms, and I'm not a fan.
If I ever decide to make another move, it would be for an Avenger.
I'd like to play with multiple arms, and I don't have the real estate for a HRX.