Pros: FAST! Very detailed yet somewhat forgiving, excellent value for the price
Cons: bass response will not please everyone
http://www.head-fi.org/forum/thread/510802/review-unique-melody-aero-custom-triple-driver-iem That's a link to my extensive review. In summary: The Aero has the Unique Melody house sound, which will appeal to some but not all. Lovers of AKG K701, Etymotic ER4S, Sennheiser HD800, AKG K1000, or Electrostatic headphones in general will likely find these to be almost perfect. Fans of Denon D2000/5000/7000, Beyerdynamic DT-770/DT-990, Sennheiser HD650/IE8, or other bass oriented headphones should probably look elsewhere. For the price, they are extremely competitive if you like this sort of sound signature.