FWIW, I tried out Virtual X on my 9.1.6 setup (I had to disable height speakers before the option would show up). It does NOT appear to work with any kind of Dolby signal tracks (i.e. you can use Neural X with Dolby 2.0-7.1, but not Virtual X). It does seem to work with all DTS 5.1 and on up.
Frankly, all in all, it's pretty AMAZING how well it works, at least from the MLP. It was almost as convincing as my actual height speakers, maybe even a little more "tight" with the object demo than the real ones. The call out demo had obvious "bleed through" to the lower speakers (sounded kind of like both playing at the same time with a bit more near the ceiling).
If it had worked with Dolby signals too, I would say it's a real winner and I'd consider getting a receiver for my upstairs Carver system (using Klipsch surrounds on a limited basis; it's mostly for music). It'd be sweet to have simulated 5.1.4 that's believable. The problem is I have over 40 Atmos titles and only 22 DTS X ones. Given it can also upmix with Neural X, I do have a lot of DTS material from regular 5.1 and 7.1 Blu-Rays that would work. I'm not sure it's worth the bother without Dolby support, though (I suppose it would depend on the price of the AVR, which would have to replace one of my power amps so it would need at least 180 watts into 4 Ohms).
Certainly, I would say if you cannot use height speakers of any kind (and IMO those "enabled 'bouncy" speakers are questionable at best), this certainly gives the impression of full height support (again at least from centered positions in the room; I have 6 seats in my home theater right now and 3 of them are in the center in a 3 row line; I didn't test the other three seats) and it beats just bed level speakers. All in all it's very impressive. Too bad it doesn't work with Dolby signals (at least the 5.1-7.1 variety).
I'm also not sure, offhand if it will work with systems with "some" height speakers (i.e. I didn't test a 7.1.2 configuration, for example. It didn't offer it with 7.1.4 set up in the Amp assign table, but it did with 7.1 only).
Click THEATER (Updated: Nov-12-2019) for pics: Epson 3100 3D Projector, DaLite 92" screen, 11.1.6 (Marantz SR7012 + Yamaha HTR-5960 + Onkyo ESPro) - Dialog Lift - PSB T45/B15/S50/X1T/CS500 Speakers & Def Tech PF-1500 15" sub; 2nd Room (Updated Apr-22-2019): 48" Plasma TV, Carver AL-III, Carver C-5 Pre-Amp, Technics SH-AC500D, Dual Carver TFM-35x Amps (Active Bi-Amp), Klipsch Surrounds ; Sources: PS4, LG UP875 UHD, Nvidia Shield (KODI), ATV4K, Zidoo X9S, LD, GameCube
: Props (Updated 11-01-19)