I'm not. Grado headphones seem to have come down in reputation a lot over the years and from listening tests, they are really unimpressive (and uncomfortable) to me. RS2i sounded really boring to me during a test, was not worth the asking price. GS1000 was even less involving. The few Hifi stores around me feature them and I've done multiple comparisons on various set-ups.
On a positive note, SR-80 is still the best open back headphone you can get for $100. The rest of the line doesn't seem to scale up particularly well (PS500 sounded like the SR-80 with added bass). And again, none of them are particuarly comfortable.
For about the price of the RS2i, get the HE-500. Much better in every conceivable way.
Can't really get HE-500 in NZ, I don't think there's a store that sells HiFiMan here..
RS2i, meanwhile, costs $570 (NZD), cheaper than HD600 and HD650 which costs $630 and $700 respectively.
And yes, while I can't say I'm 100% shocked by the outcome of Grado cans on the list here (I always found Grados to lack a bit of clarity), they do possess that distinct fun house sound.