I've had a bit of time with the FX700's now. Now that they're all broken in and I've switched between the Linearossa W1 and the Fiio E7 amp...
Well, the difference isn't huge. $85 for the W1 vs $99 for the E7. The W1 is lighter, but more "old school" with the dial volume and no other adjustable options. The E7 has all the bells and whistles, but it's about the size of an actual MP3 player and comes with a thick rubber band for holding it to your MP3 player of choice 0_o
With the W1 I'm noticing that at the max volume there's a bit of static/distortion, but with the E7 this isn't the case. It seems a bit clearer and music, especially orchestral pieces, are a bit richer. However, it's probably not discernible by the untrained ear.
I guess for anyone that's looking to drop about $350 (includes shipping) on ear buds, you really can't go wrong with the FX700's. They really do provide a nice atmosphere and handle surround sound in movies well.