Pros: Clear sound. changeable filers (black & grey)
Cons: Bass light,
Do I like this IEM? Yeah.
Do I love them? Nope.
PFE is a single BA IEM, which possess, IMO, the stereotype signature of BAs in the market. The sound signature is about clarity, balanced, and non-fatiguing. While the headstage is quite narrow, the bass is anemic. It's more for casual listening, and well, I'd praise its comfort design. Once hook up onto your ears, you can be sure to forget about it (and sometimes the music too, because it's so inoffensive and to me, unimpressive).
So, do you want to buy this IEM?
If you want something engaging, go elsewhere. See TF10 or others which really shine in a department.
If you champion comfort more than engaging sound signature, this may be yours to ponder.