I suggest reading more about it on these forums. Having heard it first hand, it is very noticeable (heights included) without heights you have surround sound, so no, that's the whole purpose of the extra channels. You also need to take into consideration of a lot of factors, room size, ceiling height etc to determine if it would even be effective in your listening environment.
I heard the Golden Ear Demo at The Little Guys in Mokena when Sandy Gross was there and there was a huge impact on surround sound with all channels engaged.
Now, if you can find the 1 or 2 movies in existence, then it may be a benefit, but it's way too much in its infancy to be described as "Killer" or "Must have" along with the fact it will face competition from competing technologies. I didn't think the simulated Atmos on standard surround content was that impressive over normal 7.1/5.1