Got these yesterday, so no real burn-in time, but initial impressions as follows:
Solid construction as you'd expect from an all-aluminum housing, but they don't protrude excessively from the ear (though I have large ears). The red and blue rings make it very easy to ID right vs. left (wish more companies did this, vs. a very tiny R or L printed somewhere obscure). Packaging is also nice with a hard plastic storage case (wish it had a cord wrap to keep the cord from tangling so much)
Definitely a 'fun' or 'colored' in-ear as described by manufacturer. Thick bass, midrange is present but not overly so, and the highs have timbre and clarity. It's very much a 'V' (or more closely 'U') shaped sound signature. Very nice replacement for your stock earbuds that ship with the smartphone.
Unfortunately, the cable has LOTS of microphonic interference. Unless you are totally still, they are present with the slightest movement. This can be somewhat resolved by threading the cable over and behind your ears, but the sounds of cable brushing over fabric, blowing in wind, tapped on when you use the in-line controller, etc. are still there, which for me is a deal-killer. This will be gifted or left at the bedside for when wife is sleeping in. Originally, was going to give 3 stars, but the sound is awfully nice out of the box, and most people probably aren't as sensitive to cord microphonic as I am.