I'm no audio expert by a long shot but I know what I like. For a long time I have been using the logitech ue 9000, I'm actually on my third pair. I kept trying to upgrade and failed each time,. The innerfidelty review was spot on, I just love those headphones so much. I just received the plantronics backbeat pro yesterday., they sound really good out of the box, they have a very clear energetic sound were the ue 9000 are more laid back, warmer sound. The backbeats bass is very, very good, she can go low no problem and sound strong, the ue 9000 can...