Anyone try this Yanqin tube buffer?

A friend recently got a Yaqin tube buffer with a few different tubes (JJ Tesla E88CC & Jan Phillips 6922). We hooked it up to his Denon stereo setup (receiver and CD player) and did a bunch of A/B comparisons with the tube on and off and roiled the different tubes. I brought over a few Cd's including John Forgerty's latest "revival" and a cool bluegrass band Steeldrivers. Anyway, for anyone with a SS digital system. You know the standard player & receiver type setup. This is with out a doubt the best money spent to upgrade to a "tube type sound"!! He got his for $100. I found the same thing online for $175 and ordered one only to find out they are back ordered for 2 to 3 weeks. http://www.pacificvalve.us/YaqinTB.html
I got to wrap this up but, basically you can put this in-line between your source and your amp/receiver and have the best of both worlds. The fast accurate detailed modern sound and the silky smooth dynamic sound of old all in one!!! No b.s. it's that good!! Latter.