I've had a set of loaned N4s on hand this weekend. Put a slightly modified set of Comply foam tips on them, and have used them with all the electronics I have on hand (MacBook Pro running Audirvana/Concero/iCan Nano; iPad Air/Herus; iPod Touch/Fostex HP-P1; and straight out of an iPhone 5; my Lynx Hilo is loaned out temporarily).
Short version: if I didn't own a set of UERMs, i would buy these in a heartbeat. They are light, comfortable, and very well suited to my listening preferences. I like things open, accurate, and uncolored, and the N4s deliver.
Only in comparison to the UERMs do these come up even a little bit short, in two areas. First, on certain tracks (only a handful, out of everything I've listened to) they can be a little too bright. Second, although string and brass timbres are spot-on, they're a little sketchy on certain woodwinds. On the second movement of the Baltimore Symphony recording of the Dvorak "New World" Symphony, for example, the solo English horn in the initial statement of the main theme just doesn't sound right; it's too flute-y (in contrast, however, John Coltrane's soprano sax sounds just right on "Too Young to Go Steady," from Ballads).
If you're in the market for a universal IEM at this price point, make sure you hear these before you make a decision.