I did - bought an E7 in October which was most pleased with.  About 2 weeks ago, the audio went silent.  All menu items worked as normal, but no audio output.  Same as when feeding an iPod line in or USB for DAC.   Sent short e-mail to company I bought it from - Micca Stores.  They responded...

Curious to see three separate listings for new er-4p IEM's on e-bay by this seller - who claims to have 10 or more on each of the three listings and sales of three, five, and seven units on current listings.  Present prices are $250, $250, and $299 but in reviewing sales made column shows recent...