The Samsung Q990D is really impressive compared to a full 5.1.4 Dolby Atmos setup with a receiver.

Pros:
Volume output of soundbar and subwoofer. I had this at level 21 and it was plenty loud.
No speaker wiring. Only power wiring to speakers and subwoofer along with HDMI to soundbar.
Immersive Sound.
Easy setup with WiFi.
Space Fit Sound Pro which basically calibrates the speakers with a mic like a receiver would, so you know you're getting the most out of your speakers.
7-Band Equalizer when not in Q-Symphony mode.
SmartThings App to adjust settings without the soundbar remote and small display on soundbar.
HDMI 2.1 passthrough for the gamers out there who want to get the high bandwith, resolution, and refresh rates out of their TVs.

Cons:
I could tell where the subwoofer was located in the room. Could also just be difference between the locations and floor types.
Q-Symphony greys out the Equalizer and won't allow adjustments besides tone adjustments to Bass and Treble.

Overall:
For the price point, this is a great alternative to get an immersive sound without paying a premium for a true Dolby Atmos setup and hassle of paying a professional to wire the speakers. Sometimes with my true setup, I have a hard time hearing the dialogue. That's probably due to the center channel not being at the right elevation due to the entertainment center I have downstairs. However, with this soundbar that would definitely not be an issue especially with the Adaptive Sound and Active Voice Analyzer.