Sennheiser CX 680i

Short-Term Use (6.00)

We didn’t have any issues with the Sennheiser CX 680i headphones’ comfort level. They’re just as comfortable as any other set of in-ears, and their crux fins help keep them in place. The headphones would still function just fine if they didn’t have the fins, which is important. Those crux fins only go so far to hold a set of headphones in, and more often than not they just make it harder for the headphones to totally pop out of your ears: they don’t do much to prevent the headphones from falling out of place. Compare the CX 680is to the Bose MIE2s, which really don’t stay in your ear well without the fins.

Extended Use (6.00)

The CX 680is didn’t really get more or less comfortable over time. That’s the true sign of well-made in-ears. If the fit isn’t great, the sleeves can cause discomfort over multiple hours of wear. We really didn’t find this was the case. We never forgot we were wearing the headphones, but we never felt uncomfortable either.

Customizability (4.00)

As you can see in the shot below, the CX 680is have a few different sleeve options. You get two additional sizes of crux fin, and two additional sizes of sleeves. Other than that, there isn’t a lot you can do to customize your wear experience.