I have Thiel 2.4s and just auditioned a VTL TL-2.5 tube preamp thru a Meridian G06 and Levinson 27.5 amp. It was absolutely amazing, utterly holographic and well, what can I say, very life-like sound, and haven't even optimized spkr wire choice yet. I have never heard such stage depth, width, and clarity in my system, and, as Dgarretson says above, the warmth of the tubes helps tame the overly-forward treble end of the Thiels. I've heard that the BAT vk3i is similar to the VTL and will be auditioning the BAT VK-3i in my system in a few weeks.