Hey, I said I thought the HP-2 lacks details and isn't as clear-sounding, not that I wanted to sell it.

Both are quite uncomfortable to wear for me. I can't stand the PS-1's combination of irritating bowl pads and weight for more than 15 minutes. Just enough time for a couple of songs. The HP-2's flat pads are much more comfortable, but I prefer the PS-1's sound with bowl pads.
They're both heavy compared to the RS-1 or GS1000. The HP-2's headband is stiff and not as easy to bend as other Grados. It makes the entire headphone inflexible and the only areas with any adjustment are the rods to extend the driver housings.
When I put on the HP-2, it feels like I'm putting on a metal mini-helmet of some kind.
I'm afraid to touch the lettering and have to be extra careful handling it. I know the HP1000 series is supposed to have super build quality, but because of that lettering I end up handling it more carefully than any other headphone.