It works just fine. What I bought it for, the ability to play any MP3 no matter what the bitrate or sampling frequency, has proven flawless so far.The only "complaint" I have is that I'm kind of a straight-ahead guy, the fewer options and complications the better.
The 450 operates from a "wired remote" with an LCD display and has to be set to do things like charge the batteries (rather than just charging automatically when plugged in). A little less flexible and a little more automatic would suit me better.