A comment on whether I can recommend this to other: Would I recommend this to others? Sure but I will do so by first telling them the price tag.
Every one who is in this thread are very much are aware on how much the F111 cost and if the cost was a factor for them they will not be reading this.
However if my little cousin came and asked me 'hey I want to get into this world, I have 600 dollars help me get started.' I will not recommend this to them simply because F111 requires (as much as I hate to use this word as it makes me look like a ****** bag) a certain level of experience across other IEM in order for them to appreciate the F111 for what they are. There is nothing about them which sings hey I am a 600 dollar product. They arrive in a cheap 2 dollar carry case which provides no protection for them. They have a plastic finish to them with a below average cable which uses metallic wire to stay on your ear.
There are frankly better gears for a beginner to use.
It takes long listening session, fatiguing IEM, over-bassy and muddy IEM, IEM which probes your year canal for one to appreciate what F111 is about. I have had the F111 continously in my ear for 4 hours and my ears do not ache. Yes I do feel I am wearing an IEM however they are so light and designed that it does not provide any pressure or feeling which make you want to take them off.
Hope that explains.