As a audio gear noob, the RE-400 was a eye (and ear) opening experience for me. But honestly, Idk if I can really recommend them. I don't like the cable that much, the cable cinch sucks, I'm not a big fan of the jack, and the build quality is lacking. My left earpiece is cutting out after about 5 months of use. The two best things about them are the design of the housings and the sound. Everything else I must say is quite disappointing. Do these two things make up for the rest of it? I'm not quite sure. If I could do it over again I'd look further into my options for a balanced, relatively neutral IEM in the $70 price range. But don't get me wrong, they sound really really good.
With that said, I have just started the warranty process. I will report back with how things turn out so others can know what to expect.