I use this thing to connect my Alexa, personal Mac Mini and dedicated gaming rig to the same set of Bose speakers. I'm no music producer or musician, but I do enjoy full quality music. Yes, it's a little ridiculous for my purpose, but sometimes you want to re-rip videos on your Mac and hear the notification when its done while playing Overwatch on your gaming PC and still ask Alexa about the weather for the big game. :)

If you're a power user type of nerd like me that likes aesthetically pleasing devices, tinkering with gadgets, overkill and you don't want to lose your audio quality just because you have a lot of things making sounds at the same time, I'd recommend this thing highly. This thing is so cool and has no flaws whatsoever.

I share an office with two other people, so I'm often wearing noise-cancelling headphones, either to take Skype calls or to listen to music on my laptop. However, my noise-cancelling headphones do such a good job I was often missing texts on my phone (on my desk, set to vibrate). I wanted something simple to mix audio from my laptop and my phone to one headphone out. It's a simple problem and this little mixer solves it nicely (and with three tracks to spare). It's very quiet and nicely made. I've only used it for a few weeks, but I really dig it. Not only can I now mix the audio sources, I also can adjust the mix easily with the faders. It's way better than a Y-cord or some other half-way solution. Worth the money.

Yes! Does exactly what I need. I can plug in my iPhone or iPad, (and all the plugs are in the back! nice...), then from the mixer into my Yamaha P-255 keyboard. I can now pan from left (the piano part) to the right (the bass and drums) on the tracks I am working on. Other tracks are "one piano, 4 hands" with one person on the left channel, and the other person on the right channel, pan to practice either one. This works just great.
( Darn photo was not upside down when I posted it. Sorry )

Works great for my needs. I have sound coming from two different computers and optical sound from a PS4 as well as a Xbox1 that each run into a DAC then into this mixer. All 4 sound sources work perfectly. I don't have to have 4 different headsets to listen to all 4 at once or switch a single pair of headphones around every time I want to use a different device. In my situation I don't have the luxury of using speakers so I have to use headphones 100% of the time and this makes everything super simple and easy to do as I always have sound from every device to one set of headphones. It is always convenient to have the sound set already for each device so I never have to worry about adjusting levels.

I just received this earlier today and plugged in a few synthesizers and sound modules into it (this will be used for music purposes) and was pleasantly surprised to hear very little noise (I wasn't expecting this to be of great quality due to the price). The build quality is sturdy for a sub-$100 mixer and the controls are straightforward and for my basic use, very adequate. I had considered the Bastl dude mini mixer that was just released earlier this summer but this seems to be better in terms of i/o options.

If they ever turn this into an audio interface in the future I'm sure they'd get a lot of buyers.