I am in total agreement with Acudef. A Good Atmos(Dts:X) is very good, but with all things, there can be a few turkeys out there.
Good up mixes are there to be found.
I for example did not find either Tom Cruise's Mummy or John Wick particularly great.
Both are Atmos and while both have moments, neither really stood out for me. Now others have posted they sound great, best ever. This here, could easily be due to my set up as is.
It was always my intention, to do like most others and go with overheads.
The hunger grabbed me and I've currently got heights.
Heights or Overheads may not of course be the universal panacea for all movies. So some may sound better or worse than others, depending upon the layout configurations. This could be especially true for some up mixes. I think, Dolby was primarily intended to use overheads and for those that could not, the bouncers. Where as Dts were happy with the height solution.
I will point out, Acudef is running 5.9
.4 and I am doing 7.1.4 and my back surrounds are pretty near to the back heights (only a about 3 feet higher) so what he is hearing purely from the bass layer, I could be too and possibly the heights mirror the front and rears more than overheads, which are I believe more discreet.
Who knows, one day I may go mad and try to add overheads as well as heights. I have the amp channels, just not the speakers or any way to mount them at the moment.