What is your favorite music service? I use Google Play All Access now, but they don't let you listen using anything but their official app…which isn't that great. Are there any that let you use anything to play back the music?
Even though it seems really tight, I just found the Fit Bit One's design flaw. It comes unclipped without your knowledge meaning it's gone before you even know. I doubt I'll buy another one when I get around to replacing it.