I have acquired one recently and I am delighted at the way it sounds its unbelievable how small the unit is but boy does it pack a punch its a bit like having your home system in your pocket its sounds that good. I have used it with both balanced and unbalanced headphones and the sound is equally pleasing through both. I know its not really the done thing but I took it straight out of the box and managed to play it for hours before I had to recharge it. I have tried it with a iPhone and with my Sony music player ( DAP ) and it sounds really good I own 3 pairs of wireless headphones / earphones and have recently bought both balanced and unbalanced cables in a shorter length so that they just hang down with the GO blu attached and they are lets say my own take on of wireless headphones with the source coming from either my phone or music player which can be kept anywhere as the signal is being picked up by the GO blu. Below are photos with the unit connected to one of my headphones using the shorter cable. I would wholeheartedly recommend this unit for on the go and I also connected the unit to a set of Audioengine 5+ speakers and used it as a Bluetooth receiver for the speakers only downside being that it needs to be recharged to perform this task.