I have one it's great, very useful and versatile tool. It's meant to be transparent which is nice when you are reamping, it keeps the original character of the guitar and doesn't try to add any further 'transformer color' or anything. Although you can also shape the tone quite a bit with the impedence controls. The clean boost is also awesome sounding and super handy to have at times. Lots of other handy shit like a Tuner out helps justify the high price a bit more.
I don't know if it has 'better' sound quality then other high quality DIs, I haven't compared directly, but it definitely gets great results for me.
