I know there's a lot of talk on this but I haven't seen a dedicated thread. The ZX300 deserves one as it does a lot of things very right in terms of what I and I believe others here look for in a DAP. I value: 1) form factor (i.e. small), 2) battery life (> 15 hours), 3) SQ (good but I'm not willing to pay for great for on the go) , 4) build quality (good enough not to have to be babied) and 5) price (~500 max) in a DAP. I don't need streaming or android features but DAC functioning is a nice plus. 1. Form factor. It's not as slim as the same form factor as the Iphone SE and AK Jr, but is about twice as thick. I wish it were slimmer, but it's still much smaller than most of the serious other DAPs, including the ZX2. Easily pocketable unless you're a complete hipster. 2. I haven't tested battery life yet but it's supposed to be about 20-25 hours which bests nearly all (all?) non Sony DAPs. (a) 3. I haven't burned in the capacitors for 200 hours as Sony recommends. I also have not used the balanced output which by many accounts is much better than SE. Nevertheless I'm impressed. It's more detailed and the bass has better texture than the AK Jr. It shares some of the rich sound of the ZX2 (from memory and with different IEMs) but seems a little brighter and less analogue. Maybe that will change with burn in. I hear very little hiss with the MD Plus, where as with my GO the hiss is annoyingly loud. 4. Build is good and so far seems on par with the ZX2, with one exception. The SE output has a plastic insert that is asymmetrically aligned with the surrounding metal. Not sure if this is of consequence. The male end still click in with satisfying snugness and an audible click. 5. You can get it from joybuy.com for ~350 with only 16 GB internal memory. That's a steal, IMO. Some negatives: 1) The USB DAC has about a 1 second delay in switching between tracks. I don't know if this can fixed. Otherwise it works fine, unlike the AK Jr. 2) Sony still does weird things with artwork and you need to embed some pictures to get them to show up. 3) Sony still insists on its exclusive cable, which means I'll be screwed if I'm traveling somewhere without a Sony store and lose the cable. 4) It insists on creating a database every time you disconnect from your computer or turn it off and on. This is annoyingly time consuming and I haven't found a way to disable the feature. Overall if your preferences are at all like mine I think you will be very happy with this as your go to DAP. (a) I believe both form factor and battery could be improved if power wise the ZX300 was optimized for IEMs and not headphones. However given how many people complained about the power of the ZX1 and ZX2 I understand why Sony bumped up the power in their next generation of DAPs. Still I would like to see them produce an IEM only DAP that is even smaller and with better battery life than the ZX300.