Exactly the opposite for me, the ps1 grabbed me where I think , the hp1s were too clinical and analytical. With ps1s, I was in the music, with hp1s, I was listening to the details.
The other thing to be aware of is if you're used to being able to get away with being a shill and not getting called on it other places, that won't happen here. Head-case is a place where people WILL point out bad behavior, generally in as rude a way as they can come up with.
And I'm assuming you don't get paid for being their representative in the US? After all, if you email cattylink, they say you handle all repair work for them.