I received my set of FF1 the other day and I have to say that FiiO's new entry level earbud has excellent sound quality for the price. The included accessories of bass and crisp foams, silicone rings and stabilizing wings, plus USB C DAC to 3.5mmSE dongle really up the value of the entire package. The cable is of nice quality with mesh sleeving from the 3.5mm plug to Y splitter, while the unsleeved cable after the splitter aids in reducing microphonic noise transmission up to the buds. While the cable does have some memory, it only holds minimal twisting and behaves very well straight out of the box. I have not had any chance to use the microphone with volume control, so no comments about that except that it is another added value to the "all purpose" nature of the FF1 earbuds.
The FF1 buds are designed and tuned in such a way that they could be used without any foams, but IMO best sound quality will be found using the included foams. Whereas the FF3 and FF5 were released with 3 types of foams (bass, balanced and crisp), the FF1 only ship with 2 types (bass and crisp). I first listened with bare earbuds and while I found the sound was acceptable with decent mids and treble extension, the bass was a little low for my listening preferences. Next I tried the bass foams and wow, those foams really lowered the mids / treble region and increased the bass presence, but maybe a little too much bass for my listening prefs. I found the crisp foams gave the best balance of sound for me. Nice punchy bass without overshadowing the mids / treble. Well done FiiO team!