Build:The build quality is pretty standard, hard plastic case with metal grills in front of the two speakers. Rubber pads on the bottom for grip, pretty standard wall mount holes on the back. LED is on the bottom facing down, and is pretty bright. Not sure I liked the "reactive mode" but "breathe" was cool. Buttons on top are metal and easy to read and use, pretty simple as well. Ports in back are straight forward and includes the aux cable if you need it.Sound:I am surprised at how decent these speakers are at full sound without distorting horribly. The bass is.... meh.. at best, but enough that you have some feeling and bass feedback from it, let's say it is passable. The mid and highs though are SUPER clear and for most music I played on it everything was very easy to hear, and I think I had better time in "Balanced" sound mode. This thing will not rock your room, but compared to a pc/laptop/tv speaker it is easily 5x the quality and loudness. While this will not beat any of the larger and much more expensive boom style BT speakers, it certainly can hold it's only to anything around the same price.Sum up and others:So it has a AUX out, so I assume you can get another and do even larger multi-speaker setups, and I can see multiple speakers of this really being able to completely fill even large rooms. I wish it had RCA as well as optical inputs, that would really cover all setups in use, but the AUX port is 75% of most people uses.It is hard to stress how decent the mid and high ranges are on these speakers, very very very clear, even at higher volumes. One thing that was confusing is when connected via BT, you do not control the speaker volume via phone, so that threw me for a loop. The volume buttons are still needed on the device, unless you turn it up loud on device then use phone volume to fine tune down. All other controls work for BT, so no issues there, and holing down + or - will forward or back the song you on. Speaker for telephone calls is meh at best, it is obviously not really used for that and I expect that. It is serviceable, no one complained when I used it and will work fine for conference calls.All in all this is a pretty good value for the $ and if you like mid and highs this is VERY clear and nice to hear.*edit* updated my score to 5 stars because vendor got back to me directly to talk about the issues in my feedback. That is some great support!