Well, after breaking in the FH9 for 50 hours and critically listening to it over the past few days, it really pains me to say this, but they are a big disappointment for me.
Perhaps I'm just especially allergic to any of the 'BA tizziness' coloration/distortion in the mids and treble that just about every BA-based IEM I've heard so far has suffered from (to some degree). And unfortunately, the FH9 is no exception. I tried the different nozzles and many different tips, all to no avail. IMHO, the FD7 is better in every sonic category I can think of. It also fits my ear better and I prefer it's thinner cable over the FH9's chunkier cable as well.
For me, FiiO knocked it out of the park with the FD7, and it puts a smile on my face every time I listen to it. But it's not perfect either. It too occasionally suffers from a mild amount of 'raspy' coloration/distortion in the vocal range, but it is WAY less objectionable than what I heard from the FH9. One track I found that really highlighted the problem I had with the FH9's vocal presentation is the song Golden Hour by Kacey Musgraves. The FD9's mids really fell apart on it, while it sounded fantastic on the FD7 (and the FD5 as well).
So back to Amazon they will go.
I do respect Dsnuts and others positive opinion of the FH9. They're not a bad sounding IEM. They have a near identical tuning to the FD7 and they also have a huge soundstage, but for the same price, I would hands down take the FD7.
YMMV, of course. I just wanted to offer a counterpoint to the (so far) only-positive things that have been said about them.