Isn't it just rebranded SA line? SA makes line for Orvis, who then bought SA, something like that? I think*
Orvis Power Pro smooth = SA Mastery MPX
Orvis Power Pro textured = SA Amplitude textured MPX
Again, I think*. The line is the same, as in materials, coatings, textures, etc. I'm not 100% sure about the tapers matching perfectly. Anyway, yes, I have the SA Amplitude MPX and it's the best line I've ever cast. It does tend to lose it's floatability on the tip over time though.