I tested the E17 with the GS4 Verizon variant. It works well out of the box. Also, USB Audio Recorder works just fine with high res files. Unfortunately, there is interference from the GS4 that the E17 picks up, even when the USB OTG cable is removed. Wifi noise, 3G and 4G noise occur. The noise is strongest when attaching the devices back to back. With airplane mode enabled, the noise is diminished, but a popping sound is getting through to the E17 still. The noise essentially disappears when the devices are moved away from each other.
The Galaxy Note 2 only shares the Wifi noise at point blank range, and no noise occurs when no data is transferred. The Note 2 therefore is a better match for the E17 than the GS4. However, the GN2 won't work with the E17 without USB Audio Recorder to my knowledge.
For those guys planning on using the S4 with E17, I suggest considering whether you plan on making a portable stack or not.