Yup, this. For 1/4 the price, my far and away choice for portable cams would be the PM-3. That said, I use a pair of the original 1964 Ears quads (ciem) for portable and Ether C's around the house. The C's are pretty great out of a QP1R or a Mojo for sure. I settled on the Mojo when away from my main rig.
Sigh. Could we please cool it on the plug wars? Dan has stated he is open to sourcing the Stax plug if it makes sense for his operation. If not, he will move forward with an alternate plug.
Some will be ok with this. Some won't. If you are not ok with a different plug, you probably shouldn't buy these headphones.
As to the connector comments on both sides, we get it already.....
Definitely this. I do this at most meets. I'm planning to bring a rig this time, but that could change to headphones, mojo and an iPhone. It is nice to have headphones you know well when you try other amps and such. In general, ask before you plug in, and turn down the volume before plugging in and unplugging.
Wonderful 2 channel audio can be had for reasonable money. Heck exquisite 2 channel audio can be had for fairly reasonable money. Or you can pay prices that as my dad says "for that money, it better have a back yard!"