I owned X3II. It is premium quality but sold at cheap price. I want a portable DAP with bluetooth to off load music from my iPhone. I bought X1II without reading any reviews. Because I put a blind trust in Fiio brand. It turned out I was wrong and dead wrong this time. The firmware is buggy. I have upgraded to the recent one 1.5. It was still unacceptable. UI response is slow. It feel like controlling Mars Rover from earth that kind of slow. What make things worst is that the touch wheel is extremely sensitive. I hate control this dam...

Background:   I own Sennheiser HD600 and Fiio X3II. I love HD600 because it is comfortable and also works well for my classical music and vocal music. But it doesn't play well with any pop music on my iPhone. I got a decent portable amp. I have tried several different brand of amp. HD600 just doesn't play well with any pop music on iPhone w/wo amp. I'm always looking for a alternative headphone for pop music.   Review:   I bought B&W P3 for less than $200 from bestbuy because I have $120 rewards expires very soon. Bestbuy provides a testing...