Just got my Noble 4. Very initial impressions (6 songs in): Smooth, excellent vocals, lots of air and tight bass. Bass is not deep but what's there is the way I like it (no slop into the mids).
One thing, the upper hinge on my storage box keeps detaching when it's opened.
P.S. Changed tips twice so far without much difficulty (contrary to what I expected based on messages in this forum).