Knowing the physics of the CVT, I'd always be careful to align with the manufacturers intent when it comes to lube. Even if their prices are the typical "highway robbery". You're really depending on that oil film to transfer the load. A clutch/band design is a much more forgiving in my view.
Having said that, if you go to owners forums and read that ten guys used Brand X fluid and ran 100,000 miles w/o problems, maybe you get some comfort zone.