One other thing to mention re Atmos/DTS:X, I know I've banged about getting a demo.....but after spending the best part of 2 months getting my garage converted, having 7.2.4 installed, and FINALLY (god it seemed like an age!) sitting down with Transformers: Age of Extinction, Expendables 3 and TNMT on good old regular BD.....it left me a bit underwhelmed. I expected far more pronounced overheads, far more spot effects, just far more of everything from above me.......
Disappointingly, I watched the next few non-Atmos BDs and something just sounded.....missing. Switching back to an Atmos title (the mighty John Wick) and it was like the sound was just turbo-charged. A combination of my calibration being done technically correct (with a SPL), leaving the surrounds and overheads a tad quiet for my liking, and me not expecting the Atmos 'bubble' - the fact that Atmos really does create a 3D bubble round you: less jolting spot effects, more immersion into the soundtrack (standing up, the overheads are almost always in constant use, mostly for the score and ambience, plus those lovely spot effects).
A couple of tweaks with my set up (turning the overheads and surrounds up - what can I say, I'm shallow!!!
) and me getting used the multi-dimensionality of these new fangled soundtracks and I'm now a massive convert.
So even with the demo, it might be worth checking out an film soundtrack that you know well in vanilla 5.1/7.1 that also has an Atmos soundtrack available and do an A/B comparison, as there is a danger that a pure listen to it won't meet expectations.
Sorry for the rambling - I've become a bit of an evangelist about these new soundtracks!!!!