Read this whole thread. Great posts, impressions and discussions.
I just had to chime in as I attended an informal Tokyo head fi'er gathering this weekend at ExpatinJapan's house, photos here - http://www.head-fi.org/t/611943/casual-tokyo-get-together/15#post_8479320
where a number of head fi'ers (7 or 8 of us) brought all of our portable gear. A ton o gear by the way! I had the chance to try my CIEMs (Rooth LS8s) with a number of combinations of amps including the 71-B, CLAS and MK III, Go Vibe DAC/Amp to name drop a few. But the point I wanted to make was that Anakchan and Shigzeo, graciously let us try their 334s, and I found that no matter what combination I tried with my customs, nothing compared to what I heard (short period of time) with the 334s. 3-dimensional comes to mind. My LS8s sound so 2-D when compared. And they are customs and I like custom fits, but the 334 universals fit great!. I was really blown away by my first impression. And I really wanted to find the ultimate combo with my LS8s, and the recently purchased ALO National. Not to say it's a bad combo I currently have, but I will be pulling the trigger on the 334s.
The only dilemma I have is universals or customs. Anakchan said the build is slightly different with the customs.
Anyway for what it's worth.