OMG!! I'm in audio Nirvana right now with nothing more than an iPod classic and $79 Vibe earphones I just purchased at Costco about an hour ago. No burn in - nothing.
I bought the Bose IEM's which I thought were decent, but they just got to flat and rolled off sounding. These Vibes bring out so much detail, depth, tonality, dynamics - they absolutely smash the bose as if the cost was 3X as much instead of significantly less. It's really an impressive sounding outfit. My home audio system is all Cary Audio including speakers which set me back over $20K (just to say I'm used to good sound). With no burn in these already sound excellent, though I expect the bass to fill in a bit with 30 or so hours on them.
If you can have a Costco nearby don't hesitate. Lots of sound for the money, they sound great with the classic, and best of all, you have 3 months to figure out if you like em or not.