I agree if you only have DT880 and you use it at home. The mojo won't make much of a sense especially if you already have the O2/ODAC. However, if you like to move around or travel a lot and bring your can with you and have a range of headphones from iems to full-size cans the Mojo makes more sense than an O2/ODAC combo. You can't use O2/ODAC while on a train or bus. (Well you can if you want to. But I can only imagine how messy that would be). Anyway, my point is the Mojo is much more versatile. Dude, he only talked about DT880. Are you saying the Mojo is optimal for DT880 than an O2/ODAC combo? iems are a different matter, O2/ODAC while have no problems driving even the most sensitive iems is not optimal due to many reasons. SQ is the least of your worry.