I went to a store and tried the Utopia out of the Simaudio 430HA and compared it against the HE-6 out of the same amp. The guy at the store almost didnt want me to try the Utopia saying they had not been completely broken in and that he doesnt want me to not be impressed with them? :/
Upon asking he said theyve been broken in for 2 days but he went on to say they need two weeks etc. I insisted saying that I know the Utopia gets sufficiently there with 40-50 hrs, but he seemed to know it all apparently. In the end if I am listening to these or not, he said ok go ahead and try it.
Against the HE-6 my impressions were:
-The HE-6 extended lower and the bass hit slightly harder, but the Utopia is no slouch (looking at you HD800)
-The mids on the Utopia were just simply better ans felt more real
-The highs on the HE-6 had a bit more energy up top, which I really liked
-The microdetailing and layering on the Utopia is extremely good, where I think my HE-6 wasnt doing as good. The sound stage also was maybe a bit better on the Utopia but they almost sounded similar to me there because the music I listen to does not utilise wide soundstages anyway.
-The Utopia felt like a complete sound spectrum, with nothing sticking out and just working perfectly in harmony where the HE-6 just seemed more fun overall.
I think overall the HE-6 had more of a "kick" to them for electronic music for me, but I can imagine how the Utopia are more refined and how a lot of people would love them. Theres nothing "bad" on them whatsoever. Im going to stick with the HE6 and get a J2 to drive them.