ModWright Tube Buffer

Does anyone have any experience with the ModWright Analog Bridge Tube Buffer? I'm thinking about adding it between my Musician Pegasus R2R dac and a Yamaha A-S1200, but am a little put off by the price (~ $3,000 used) considering it's nearly as much as the Yamaha.

I'm generally satisfied with the Yamaha/Pegasus combination, but miss the tube flavor that used to power my Klipsch Cornwall IVs. I've contemplated returning to a full tube amp, but I really don't want to deal with the revolving door of tube replacement (I put a lot of hours per week on my system). 

Thanks for your thoughts.