Honestly I have so far found it to be a pretty huge upgrade. It's different then what I expected, but it has made my room sound huge. More then simply giving you overheads it expands the sound field very significantly. I've had Atmos less then a week, but so far I'm ranking this only behind my subs and room treatments for impact of my soundCome on guys... no way. No way. Going from Stereo to 5.1 was such a huge leap, I don't think anything will compare to that. I challenge you guys to run some scenes from some impressive Atmos movies (Gravity, Fury Road etc.) and then run the scenes again in 7.1. I have done that at a friends house and the difference is there for sure, but it is NO WHERE CLOSE to the difference between stereo or pro logic compared to 5.1.
I will say that recently my friend Archaea has been playing an Atmos Star Wars game and he says it's a huge improvement from what you hear in Atmos movies or even in the Atmos demo disk. I haven't heard it yet, so maybe the Star Wars game is as big of a jump as you guys are saying - but - movies or even the Atmos demo disk is not like going from stereo to 5.1.
The Atmos demo disk is great and shows off Atmos really well, however I own that disk and in my room it's also VERY impressive played on a 7.1 system.
For me Atmos it is a no brainer upgrade and I plan to do it myself when the price of AVR's comes down a bit and the format is more solidified with DTS X etc. However, I'm under no delusions that this will be like going from stereo to 5.1 because I know it won't be like that. In fact that's a huge reason why I am waiting for prices to come down. I know exactly what I'll be getting and paying 2 grand or more for the AVR alone does not make the difference worth it to me. If/when you can get an AVR for closer to 1000 that will get you to 7.1.4 (even if it means using external amps) then I'm in.
I feel bad for the guy that follows this thread and hasn't experienced Atmos for himself and goes by the hype that he reads here from some of you guys. In my opinion he will be disappointed when he fires up Atmos in his room for the first time and realizes that while it is very cool and indeed an upgrade it is not the night and day/black and white difference from 7.1 that some of you guys say it is.