Have the Grado SR80i and I've been using it together with the Note for over 3 months now. Sounds great! Prior to the Note I had a Iphone 3GS and I can't hear any noticeable differences. The Grado SR80i is a great headphone.
I never listen to my Grado on max (standard) volume. When I'm at home it's nice and quiet so the volume doesn't have to be that high. When I'm on the train or the bus the volume doesn't go high either because of the open design other people will hear your headphones very clearly. And I don't want to be an A-hole so I turn the volume down a bit.
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