I owned the iSine 10 up until recently. Really liked it. Does require EQ to standout. Fit was weird, but actually really, really comfortable once you figure it out.
I now own the Unique Melody ME1 which is a planar IEM as well. It has a more IEM look than the iSine. Looks like a miniature LCD-series in your ear. It’s got good deep bass, and rich, thicker sound than the iSine, while still retaining good detail. iSine probably has more air to it with the EQ settings from Audeze (or Cipher cable), but the ME1 is easily EQ’d as well. Stock ME1 sounds better than stock iSine 10, but EQ can be done on both to sound great. Stock ME1 is a little shouty though, as it has a peak around 1KHz. Toning it down really helps a lot.
I currently have my universal ME1 at Unique Melody in China right now to be re-shelled to be a CIEM. They said it may change the sound signature a little bit, so we’ll have to see how it turns out when I get it back, whenever that’ll be.