Are any of those usb-2-go DACs going to rival the DX100? the DX100 uses the ES9018 DAC. Almost all the iBasso kit that the Samsung Galaxy S III drives uses the Wolfson WM8740. So I wonder how these DACs compare.
As a previous owner of the DX100 (and might get it back), I can confirm that it sounds amazing, big size wise, but amazing.
Comparing it to the Note2 is wrong (completely different), even when amped the Note2 loses, why?
Simple answer, 192/24 support! the Note 2 with a DAC/amp, even if the DAC supports that bit, it will not be able to play bit by bit (Android is limited to 44.1, and Ibasso had to bypass this by its own driver/player).
The synergy in the DX100 between its components (DAC,amp..) just work with almost any IEM or full headphone
The software of the DX100 is its Achilles’ heel . Its slow (Gingerbread Android version), hangs a lot , and had some issues in SQ between different firmwares, but the latest firmware took it to a new level (unfortunately I missed that version) in SQ.
Ibasso might open its API to other developers to update their players to support DX100 (they work but there is a huge gap in sound) like Power-amp and Neutron , and will be able to play 192/24 bit bit by bit
Back to Samsung, Apex Glacier & Note2 is better, not in SQ but as a whole package.(Power-amp showing song's album-arts looks amazing on the Note2, and the UI fast , really fast ). What works for me might not for others, its a matter of priorities &/or prefrences.
If SQ is all what you care about (and can bare all the cons), go for the DX100 and never look back.
Ibasso might remove Play-store support and kill other processes not audio related, in a future updates, to improve the UI lag, so ...