I currently have 5 Echo devices around my home and I preordered one of these to give the stereo paired second generation Echos in my lounge a fuller sound with a bit more oomph. It arrived on the day of release and was fairly easy to set up, it took a couple of attempts to link it to the two Echos but no more than a 10 minute job. On lower volumes it gives a nice extra depth to the music but crank it up and with the right choice of music it can be positively gut wrenching and something to really upset the neighbours...I love it !! All in all it's great addition to the system and if you are serious about your music it's well worth the money.