They are excellent. I've used a number of them on 46 to 91 engines. Every one of the engines has done well with at least one Evolution.

They certainly look to be precision don't they.

As for whether or not they're stiffer or less stiff, what really matters is how they perform on the engine in the air. And they certainly do that.

And if we gave awards for how they look on the ground, they'd do well there too.