Bought this over a sound bar since I had a Firestick 4K. The sound quality is good but not great, which is fine considering the price. The device advertises itself as Dolby Atmos but there are barely any title with Dolby Atmos on Amazon Prime. Fire stick 4K does not support Dolby Atmos on Netflix. I have read that Fire cube supports Dolby atmos but Fire Cube isn’t available in India. HDMI Arc is not supported, however you can connect by Mini Optical for using external input. Much touted feature like 360 audio and Amazon HD music are yet to release it India.
Overall, buy the device for a decent smart speaker, nothing more and nothing less.
UPDATE The device has audio issues almost every day while being paired with Fire Stick. Tried everything including pairing and unpairing. That solves the issue for a while but again it appears. Connecting by Toslink doesn’t let you control the volume level. Overall, I am not satisfied with the product due to the audio connectivity issues. Get a normal HDMI ARC speaker. Save the headache.