We have an old TV in our Tea Room at work, RCA only. This little guy runs all lunch break converting the HDMI from a Nintendo Switch to RCA for our enjoyment. The colours are more washed out from standard HDMI however this could also just be the old TV.
The USB power in can also be powered from a power bank, which allowed me to set up a portable retro gaming console station.
For what it's worth, it's great to have, I also have the AV to HDMI so I'm ready for any converter situation.