A louder volume and greater dynamics. At first, I wasn't sure about the extent of increase in dynamic range; but when I carefully controlled for the loudness increase that the buffer provides, the increase in dynamics became apparent---at least, in my system with my ears. YMMV, but I think lowering the output impedance of the pre resulted in increased dynamics.
If you decide to audition the Burson, be sure to post your results. I think this is a overlooked gem in maximizing one's system.
If you decide to audition the Burson, be sure to post your results. I think this is a overlooked gem in maximizing one's system.