You can count me in as a Grado groupie!!
I bought my first pair of Grados an hour ago, the SR80i, my first pair of full size cans by the way, and I already know I'm going to buy the RS1.
I've got a fair amount of burn in ahead, but I can already hear where there going and I love it. They make perfect sense for an Ety er4s lover.
I must say though that the build quality is, well, cheesy. But the sound...oh the sound!