I've used it quite a bit - and the few plants I don't have in S/H are in Orchiata. There is a major distributor near me in Atlanta, and the owner is a member of our Orchid Society, so sometimes she brings a few bags to meetings, and I think we get a lower cost. And Phillip has gone over to the offices there and bought it straight from them.
The main reason that Orchiata is so expensive is that it doesn't break down, or decompose, nearly as fast as other kinds of bark; it's made from radiata pine bark from New Zealand, which is considered some of the best around - much better than fir bark in that way. It will probably last up to 5 or 6 years, so it's economical in that sense. You can use straight Orchiata to pot your bark-potted plants, but, to make it go a little further, I added perlite, charcoal, and volcanic rock. That's just my particular mix - I'm sure others do differently.
That's my experience with it, but it's just become available to us, so I can't say from experience that it will last as long as it's supposed to. Other members may have longer experiences with radiata pine bark.