While my experience with non grados is limited, Grados headphones just let me connect to the music, specs be damned!
On another thread, we were talking about the hrt microstreamer, and how it had soul, grados have soul, its that thing that can't be measured , but just has me smiling, grooving !
I basically agree. When I'm in the mood for some warm-toned fun I reach for the HF2s. When I want to hear every detail I reach for the HD650.