While we patiently wait for impressions, you can vicariously live through the HA-1 experience by reading the HA-1 Headphone Amplifier Users Manual.
Ordered mine today 5 minutes after receiving my notification e-mail. I'll be able to share my impressions with the LCD-2 rev2 and the LCD-XC. Hopefully I can articulate what I hear for you guys. I also can try it with the AKG-K550 and the Vmoda m-100, though these are more for work and portable respectively, not home listening. For a source I'll be using my MacBook Pro, Oppo BDP-83 and the Fiio X5 playing multiple formats including many high resolution files.
For now it's the excruciating wait for the shipment.