I'm never going to hear a megaspeaker in a good room am I?

Duke, I think you explained it better than I could. I almost bought the Snells. I think I wet my pants the first time I heard them. I wound up buying the Sound Labs 845 immediate spiritual ancestor 
We are all stuck using residential size rooms. Choosing the right speaker is the most significant "room control" you can buy. It can also save you a lot in extraneous room treatment items. 
The problem with many of the most expensive speakers is that they are more omnidirectional which makes them sound worse in hotel rooms.
But, they have exactly the same problems in residential settings. A speaker that can sound good in a hotel room can sound good anywhere.

     Thank you Erik and Duke for a good discussion about speaker radiation patterns,direct sound, early reflections, RT60 reverberation times and room acoustics in general.  I feel like I'm in school, in a good way.  You guys have got me reevaluating my acoustic strategy and making sure I'm comprehending everything correctly.  
     In my recent systems, Magnepan dipole speakers with their figure-8 radiation patterns have been a constant, previously with a pair of 2.7QR and currently a pair of 3.7i.  I've always sort of forged my own path, based mainly on research and experimentation, with how to set up and handle room acoustics and reflections with the somewhat unique challenges of dipole planar-magnetic panel speakers.  I've settled on relying on the rudimental guideline that it's important for the direct sound waves from the front of the panels to reach the listening position first, with any reflected sound waves not reaching the LP for at least a half a second later, in order to maintain good tonal accuracy and stereo imaging. 
    Fortunately, I have no doubts about my system and room having the very difficult and very important bass frequency response levels performing at an extremely high level.  This is due to the Audio Kinesis Debra 4-sub DBA system I utilize, which provides a near sota solid bass foundation, either with or without acoustic bass room treatment assistance.
     Then there's the eternal question of how to handle the out of phase sound waves constantly being emitted from the rear of both Magnepan panels.   Is it best to absorb this back wave, diffuse it or a combination of both?  After extensive research, professional advice and experimentation, I decided to deploy a combination of absorbing and diffusing acoustic panels along my front wall behind the Magnepans, with very good results.
     Overall, I was heavily influenced in my room acoustics treatment decisions and strategy by Anthony Grimani based on these videos:

https://www.youtube.com/watch?v=1bbmWd00HYM

https://www.youtube.com/watch?v=DFbqJkjfABQ&t=285s

https://www.youtube.com/watch?v=raAyF5ksbkk

     I agree that the preferred starting point of a system is the loudspeakers chosen, and I definitely prefer the presentation characteristics of Magnepans thus far as my starting point.  My current preferred strategy on room acoustic treatment is to control the early reflections through absorption, don't over absorb anywhere and use a general combination of absorption and sufficient diffusion elsewhere to strike a beneficial balance between them, especially at the front and back of the room to keep things lively.   
     Most importantly, I'm very pleased with my perceptions of my current room treatment efforts and my system and room's overall sound quality.  I'm just curious, based on both of your recent very relevant discussion topics on this thread, how you two would evaluate my room treatment efforts?
      I understand we don't typically know what we don't know. I welcome all constructive criticism and utilitarian advice.

Thanks,
  Tim

Tim: 

Half a second?? Delay between direct and reflected? That's 550' long! :)  How do you accomplish that? That's no longer going to be a reflection but a distinct echo.

Like duke was suggesting, most think a 10-20 millisecond delay is ideal.

Erik

" So if 99.9 % of us will never hear these speakers or see them in a good listening room, maybe Stereophile should stop reviewing them and let a magazine like Oligarchs Monthly. "
As an amateur speaker designer and builder for over forty years I eagerly sought out reviews of mega speakers; looking for ideas and innovations to steal.

Have your system's front wall, at an outside rear wall of your house. Mount a  40 foot long (or more correct length) bass horn to the structure. It has been done. Yea, you will explain to your wife why it is very necessary......