Summary: These little guys sound amazing for the money - does require about 24hrs of burn-in before things loosen up and sound right. Even, full bass due to the added port over the E3's. This was my second pair after the cable separated from bud after about 1-year's regular usage.
Pros: Price / Performance, Sonic Fidelity, Comfort
Summary: These are my go-to headphones when I don't want to use my customs. They are easy to wear, sport all-day comfort, provide reasonable isolation-- to excellent if you buy the foam inserts, and are a full-range in-ear monitor lacking very little, and a steal for the price. I own 3 pairs.
Summary: Had these things for a while now, and still use them with almost anything that has a headphone jack attached to it. My phone, my old iPod, my iPad, my pc, my laptop, and they always find a way to sound really wonderful.
I'm not gonna lie and say I'm some headphone guru. I'm not.
Pros: Very detailed yet relaxed presentation with sub par inputs (like my phone or MacBook Pro)
Cons: For what they are, haven't really found any.
Conclusion: That said, problems with the Shures are firmly restricted to the nitpicking column. The bottom line is that the ultracompact Shure E4c earbuds sound flat-out amazing. They're the best in-ear headphones we've heard to date.
Pros: Some people find in-ear headphones uncomfortable
Cons: Excellent sound quality, Earpluglike design blocks environmental noise, Thick, durable cable design, Includes full assortment of accessories