VAC Signature mk2 vs Purity Audio Ultra?

Has anyone compared the both or owned both before? I noticed Purity Audio is using super large Cast Capacitors and Bybee Rails in the signal path. The internals looks sweet but the price is a killer.

Take a Look Here: http://www.purityaudiodesign.com/ The internals on the Ultra look top class of course when someone is asking 25 grand and up for there preamp line.