I bought these he-350s and the new hyped up monoprice monolith m560s to test out and I'm actually surprised, I prefer these over the m560s, which are planars. These have huge soundstage and a certain airiness to the music overall. The m560s, even though they are open, they sound like closed headphones. Not much soundstage. I can barely tell the difference between having them closed or open. The m560s are a bit more detailed though, probably because of the planar drivers. (The amp and DAC I'm using are the O2 Amp and the SMSL Sanskrit.)