...so I've bought all of the above used/on sale with the intent to compare/play with all of these and only keep one or two for the long haul/flip the rest to get my money back. But I mean...holy crap. I'm a musician and have done the whole gear thing to death over the years as far as guitars/synths/amps/effects goes, and I guess this was inevitable and bound to happen with headphones and dac/amps. But yeah...I'm going to be popping in and out of this thread over the next few weeks just to record some "real world/every man" type comments on all of them and how they work for basic cell phone/pc compatibility. But already, I can say the following in short: 1. I love Fiio to death for what they are/what they do. 2. The Oppo HA-2SE really is the all-rounder for build/function/sound...total shame they've folded further production. 3. IFI has a nice platform with the "X Series" going into the future...still waiting on a type A to Type C OTG cable to come in, though the Bluetooth connectivity seems nice. 4. The NX4DSD is a no-brainer for the price point, though a bit "China" in build quality. 5. Massdrop needs to get the Dacportable to me...like now. ...freakin' crazy hobby this is.