I get that IEMs are a great option under a 150 bucks and also convenient for traveling, I own two pairs myself and they are decent. But I've tried two open back headphones now and they both eclipse the IEMs in a way that can definitely not be replicated by IEMs. The sound is really "outside your head" and airy, whereas IEMs sound exactly like you'd expect them to sound. Often they can't even get omnidirectional imaging right and have blobs, and soundstage is very constrained.
So, why are there people spending tons of money on (C)hifi IEMs when they only listen to them at home anyways?
ATH R70X are so lightweight that you barely feel them (they are like half the weight of HD600s) and the wing system also prevents a pressure point. No excessive clamp either.