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I have HE-400s. Would this go good with them?
I think so (I'm no expert). The HE-400's are 35 Ohm and have 93 dB/mW sensitivity, so they will need about 160mW power to get to 115 dB SPL (really loud). The specifications on this amp say that they are getting about 600mW power into 33 Ohms, so the amp should have more than enough power for the HE-400. Hopefully someone who actually knows about this stuff will comment.
The O2 was meant to be a one-size-fits-many solution. IIRC, the only headphones the O2 won't really work well for are electrostatic, and maybe planar? I'm not familiar with either of those headphone types, but anything else will likely work fine.