Really nothing too spectacular. I actually don't use it at all anymore unless I am recording to my Tascam 388 & I need more tracks w/ phantom power & exhaust my other 1st pick pres because the 388 doesn't have phantom power. That said I paid $70 bucks for it & it does get the job done. Building out my front end is definitely one of my top priorities and that'll start w/ more preamps so this one likely won't be around much longer.
The "tube" part of this implies some nice harmonics if you push it & yeah, it does that kinda except the sweet spot is super small & if you go over it? Really not a musical sound at all. I suppose it could be used for heavily coloring of a source. Maybe I'll be inclined to try that at some point.