What's the current opinion and state of play of Auro-3D? I see that Denon and Marantz are offering software upgrades (at a fairly hefty cost in the case of Marantz but I don't know about Denon) but does anyone know what the takeup has been like? A year or so back it looked as though Auro-3D was bidding fair to become a serious rival for Dolby Atmos but that excitement seems to have rather fizzled out and I don't recall reading of any commercial DVDs or BluRay discs that have it. Since I was doing a complete rebuild of my cinema area at the end of 2015 I put in the extra speakers for Auro-3D but did nothing more about it at the time. Now I'm beginning seriously to wonder if it's worth the cost and the trouble of going down that route. All the reviews I've seen mention that the Auro upmix software is extremely effective, but even so... .