I wanted to get some new IEMs to replace my Final Audio E5000 IEMs, and after several days of research, I purchased the FH3.
After listening to them for a few days now, I can say I definitely made the right purchase. The audio quality and comfort are both superior to the E5000. The E5000 are bass-head IEMs, which is nice, but there's just too much of it. The low end overpowers everything, and the mids and highs end up sounding veiled. In comparison, the FH3 are much more clear. There's plenty of low end, and the bass stays there, not interfering with the mids and highs. I would say instrument separation and soundstage are both superior to the E5000, which is a bit surprising, because the E5000 are vented to such a degree that sound leakage is a problem.
The FH3 are more comfortable to wear for longer periods than the E5000. After a couple of hours, I'd have to remove the E5000 for a break. With the FH3, I barely notice they're there.
Lastly, the FH3's cable is much nicer to deal with than the E5000's cable, which is obnoxiously stiff and annoying. The FH3's cable is soft and tangle-free.
Price paid for Final E5000: US$279
Price paid for FiiO FH3: US$130
Proof that "more expensive" doesn't always mean "better." Very happy with my purchase!
Sources used for both IEMs: FiiO Q1 MkII and Radsone EarStudio ES100.