Tyll recommended this over the Fidelio L1, which is said to be really really good. (Still no response from that rep that said I could have a pair...) Some have said the L1 is a bit better than the Z1000, and while the Amperior will sound completely different, judging from the fact that Senn said they tried to make the Amperior sound the same as the HD25, it's still compelling. Just hoping that the price drops quickly like with the HD598.