NAD 1000 preamp

Hi, just purchase the NAD 1000 Monitor Series. I got it at a really good price. I had an Adcom GTP-350 preamp that work flawlessly but sold it due to upgrade bug. Has anyone try the NAD 1000 pre and if so how does it sound to you?
I can only comment about its performance with headphones, the HD600's sounded good. Controlled bass, and nice instrument separation with classical and jazz.
Thanks for the response. I have not tryed it with the headphones.