Another comment from my questing days. I've got a Sansamp Bass DI...never really loved it. I've used it at various times to add grit and usually some thickness, but it's always been more of a on the fly, compensate for a ****** rented amp thing for me, not part of 'my' sound. I like distortion that breaks hard and has a certain richness/activity in the mids - the Bass DI is more early saturation and low end hair. I currently use it with the drive cranked, bass and treble at 9:00 to bring the mids back, presense at noon and the blend cranked. This gets me into super saturation, fuzzed out wall of compressed distortion that I use to feed my whammy in octave down mode, into my SA BEF Pro to get some really awesome synth sounds.
For tool tone chasing, I ran it after a Ibanez Phat Hed, which was the first pedal I ever bought. I used the phat hed with moderate drive and a strong treble boost, then used the sansamp with the treble rolled back and light drive to put the balls back into the tone and fill out the dirt spectrum. Gave me a shade of the JC sparkle/crispness with decent punch.
This past week, a B7K has replaced all that.