I've been on Blue / Blue all day with Whirlwind and they are lovely! I'm a dedicated foam guy; using Comply T400 or Dekoni Bullets on my Xelentos, IE800, M3s and am very happy with them but on these RAHs the Whirlies, for me, open them right up. With that 15mm DD in there, the RAHs don't need the help of foam to deepen the bass. And with the Whrilwinds wide bore the treble is crisp clear clean ariculate unobstructed and sparkly! I think I may have found my winning combo. They've got about 75 hours on them now, so we'll see how they change moving forward but it think I'm sticking with this combo until I reach 150hrs with them and go from there. Very happy with these babies.