Not sure yet. I don't think the R3 is better than the RE-400... a little less mid-centric maybe, but also a bit dull on top.
I gotta say Flux still managed to positively surprise me. First off, the soundstage seems unreal for someone who thought cx400s are decent IEMs. This is just what I was looking for: all around clear sound with good vocals, instrument separation and bass that doesn't conjure up "lows" where none are to be found (e.g. The Agonist's Lullabies-album) but especially electronic music has quite the punch. These are also way more comfortable than the Sennheisers both in terms of ear fit and the cable not constantly pressing against my ear cartilage when worn cable down. It even feels like the included pouch won't fall apart after a year. Thanks again ljokerl for the recommendation. I did notice these in your reviews but, as I said, the "50$ headset can't compete with *real* IEMs" -misbelief got the better of me.
Don't know about the pouch, but I agree with the rest :). Glad you're enjoying the Flux!
Not too worry, there's not many things I've heard in depth but haven't reviewed