First, let me say that I use these Blues with a DAC (Meridian Explorer 2) on my laptop, personal PC and work PC. The entire setup is portable enough that I end up taking it just about everywhere I go. The source files are all Apple Lossless or FLAC and range from Classical to Classic Rock to Metal, with a bit of Techno thrown in from time to time. Now for the review... The MoFi's are nothing short of amazing. I have a pair of Sennheiser HD 650s which I use with a desktop headphone DAC and AMP. These were my go to / reference headphones when comparing other products. I adore my HD 650s. The sound is amazingly clear, detailed, with little bias in any frequency. It's easy to see why they have been an audiophile favorite for so long. With that said, I can say that after 2 months of using the Blues, I vastly prefer the MoFis over the 650s. Where the 650's are a clean, flat, reference friendly sound, the MoFis are much the same but with the excitement knob cranked to 11. It seems like they are not emphasizing bass or mids or highs, rather it emphasizes everything all at once. It's really difficult to describe. Turning the built in amp on makes the sound come alive. I don't know if the Blues present a better sound stage, or what magic is happening, but to me they're hands down better. With the bass boost on, it makes my techno tracks so energetic, without losing clarity or definition in the mids and highs. Some headphones can drown you in bass, but the rest of it gets muddy or unclear. Sound isolation is also (disturbingly at time) amazing. I was listening to my Blues while surfing the web, and had no idea a family member stopped by my house and had been standing behind me for 10+ minutes. They were playing with my doberman the entire time, and I couldn't hear a thing. Now... on to the things you may not like about these. They are made of seriously solid materials. I have no doubt they will stand up well to daily driving. The problem here is that they are going to be heavier than most headphones, especially portable / compact cans such as the Momentum IIs. That said, unless you have neck issues of some kind, I can't really see it being an issue. Another issue would be with the tension system. I know I have a large head (it houses my huge brain), and typical hat sizes and other things don't usually fit me. I had serious concerns about this when I tested these in the store. Hoping that they would break-in and become more comfortable, I bought them anyway. Luckily, they did break in after a few weeks, and are extremely comfortable to me. The memory-foam headband and earpads are fantastic. I believe each is over an inch thick. Anyway, I highly recommend you try these. They replaced a 5+ year love affair I had with Sennheiser. Sad but true.