Hi,
In reading some of the posts above, I have to agree. The TF-10 out of the box sounds great but is the most uncomfortable IEM I have ever used. My solution was to have them remolded. This may seem aggressive to some but that made a useless item become useful. I also added an amp and line dock. I use the HotAudio DV1 and the FiiO L-9. The volume control on the amp is a digital device that incorporates a balance feature. Finally I added a silver cable from ChrisHimself (do not skimp on a cable, it DOES make a difference). I do not need to use only FLAC/lossless/or WAV files; MP-3's and m4a sound just fine. After several months of break in and use I am very satisfied. My biggest concerns are losing the rig, damaging one of the components, and running out of batteries. Everything sounds great. All of the other toys are on silent display (Stax SR-404, Stax SR-003, Etymotic ER-4p, Etymotic ER-6i, Grado SR-80). And I am not looking to replace anything, I'm having too much fun discovering what material I have been listening to for years sounds like - gosh there is some great stuff out there. (Right now, some old Rory Gallagher live sets from Europe).
Regards, PETER (just my opinion and experience)