Decware Z Box

Has anyone had any experience with this particular tube buffer?  This is a " ....I can't stop tinkering..." question for sure.  I use an Electrocompanient ECM Dac/Streamer which is very very nice.  But recently while shopping for a dac for my second system in my office I listened to a tube dac and upon return home to my ECM noted that the tube dac added texture and overtones to voices and made woodwinds sound more "woody" for lack of a better description.  I have had several dacs and really do not want to replace the ECM.  So I wondered if adding a tube buffer might nudge the ECM towards the tubed dac's sound.  As always thanks in advance for your insights.