I have owned both the HE-400i and the HE-560(grill, pad, cable modded), and I own the M1060v2(modded) as well as the ZMF Omni/Ori. I currently am only using my single ended amplifiers at the moment which are the Meier Concerto and ALO Pan AM for my desktop. I have yet to try it with the Concerto but so far with the PanAm with green JAN GE tubes these headphones sound fantastic. They have very good clarity, microdynamics is solid, attention to fine details and nuances well done, imaging so far with the tracks I have tried have been good. I don't remember the HE-400i as much as the HE-560, but I also had a more powerful amplifier via balanced system from Audio GD at the time. Even still with the differences in headroom via amps I feel this headphone is equal to the modded HE-560 sound wise so far, the differences being that the HE-560 has more of ethereal characteristic where it kind of floats around you but so much directly in front of you ( great for some music but not as much with some things) I dont feel like I am lacking space though with this headphone. It is spacious and has a good sound stage, and the HE-560 is more lean sounding throughout the midrange and a bit brighter (without the mod) through the treble. This headphone has a brighter character in comparison to my Omni but not sibilant to my ears so far with what I have played and used via Amps/DACs. The build and quality of aesthetics is really nice, "WOW, I feel like I bought something that actually looks priced right" Lol. Feels solid and pad comfort, though a bit thinner than something like like ZMF pads is still comfortable. Though without positioning adjustments for someone that has a large head(which I do) can put a bit of on top of the head, and I feel like someone with a more average size head would probably find this very comfortable rather than just comfortable. I am looking forward to trying this with the concerto, ibasso PB2(balanced with Fiio x5 mark3 as source), Meier 2stepdance portable amp, and possibly my nfb 28 once out of storage. I will also being doing a full and more detailed review once I have had some hours and variations of genres/amp/sources to mix match with. I will also being doing a comparison for entry level planar to more mid tier and entry high end with the three planars I have on hand: Monolith M1060 v2, AR-H1, and ZMF Omni/Ori.