Ooh,.. a nice empty forum for me to discuss things I know absolutely nothing about (to quote Father Guido Sarducci).
Unfortunately Xavier, have problems with most in ear monitors so I can't really say that I've listened to enough of them to speak with any authority (as if that ever stopped me in the past!).
Some of my Headfi pals do like the Yuins and just like so many things in audio, until you've tried them yourself, you'll probably never know if they're your cup of tea.
That said, I don't know if you've tried "in ears" or clip ons but I do have a pair of each that are just collecting dust. Just say the word and I'll get them in the mail to you this week (the IEMs are Crossroads MylarOne X3. I'm pretty sure I still have the selection of ear adapters. The clip ons are Yuin G2a. Both are new ones I won in Heafi meet raffles).