Summary: While the Etymotic ER-4PT MicroPro earphones offer excellent audio quality, we found the custom molds difficult to insert. Still, if you don't want to spend more than $300, we prefer the sound from the ER-4 more than the Sonomax eers PCS-250. We recommend skipping the custom molds, though. With the plethora of tips that come with the earphones, you'll most likely find a set that fits just fine without having to spend an extra $100 for the molds.
Summary: While the Etymotic ER-4PTs have less low-end oomph than some competing earphones in this price class, they deliver excellent sound with very accurate tonal balance.
Pros: The Etymotic MicroPro ER-4PTs are accurate, well-balanced in-ear headphones. Their treble clarity and precision let you hear details in the recording, and they exhibit a richer and more satisfying balance in bass and midrange than the Etymotic HF5s. The ER-4PTs are solidly built, and a protective case and airplane adapters are included.
Cons: The thick plastic around the ER-4PTs' plug may restrict access to some smartphones or audio devices housed in cases. If you like a lot of bass, the ER-4PTs will come up a little short. Complete sonic isolation and some cord-related vibrations can also interfere with on-the-go listening.