I agree. I will even say it01 is one of the best under 100 bucks.I am not a DAP expert so cannot really help you with that, sorry. I do however know about IEM's and it would be my strong preference to have an IT01 over an F9 Pro. I just think the IT01 is a really special IEM that far exceeds its pricepoint in performance. The cable is fantastic, too--more like something you would find on a $300 IEM than a $99 one. I have found mine to be durable as well. Some thoughts for you.