Start with the most of this object: the sound !!! it's just huge !!!! I use in-ear Shure or supra Bowers & Wilkins is a killer ... nothing to say about it ... but here it means that once spent $ 800 you will have to spend again 300 mini headphones for exceptional because in the little box you do not even have a headset, even if only to test the beast .. . The interface does not connect me more than that either ... So I do not find it very convenient to use, very expensive but I keep it because the sound is monstrous ...