Etymotic Research ER 4XR Customer Service

[CPR]

In a word; INCREDIBLE! Though pricey; ($350), after 15 months, the left channel, became distorted
Constant intermittent loss of sound
long story short; called CS; they overnighted, a new custom cable
bottom line; good as new!
Can't wait for their "wireless" version, in 2019
Best in-ear experience on the planet