Ok, so I'm probably getting a iBasso T3. I just have one more question though: how many times better is the T3 to the Fiio E5 in SQ improvement (including bass)? The T3 costs 6 times more...is it worth it?
That said, Skylab - in his massive review of 37+ amps - said that using the T4 was no better for many phones than using nothing at all. And personally, when I tried: iphone-TF10s vs iphone-e5-TF10s vs iphone-T3-TF10s, I found that the e5 made a SLIGHT difference vs nothing, but almost not enough to justify carrying it at all. The T3, however, made a significant difference in SQ. Something like the RSA Tomahawk or Corda XXS would have a slightly better SQ, but be many times the size.