Ibasso originally declared that the DX50 would be a "no compromise DAP, affordable to everyone". Common logic states that one of those won't be true
Back to USB OTG: If you guys are looking at USB keys, I highly recommend this compact 64gb one from Kingston. All metal, very compact. Add a low-profile OTG cable like this and you've got 8+64+64gb of solid state storage with minimal power consumption on your still pocketable DAP. Who can beat that at this price point?