The Sansamp/M80/Behringer is a bassist's tool kit. It's a distortion, a preamp, and a DI box.
What are YOU using it for?
Of those, preamp and DI.
Would a pic of the settings help you?
I run the preamp stuff pretty flat. Boost the lows. If I were to think of one word to describe it, it gives my rig "Balls". Big ones too. If my rig was the declaration of independence, the Behringer would be John Hancock. Don't get me wrong, my 15's sound huge without it. But the behringer grabs you by the short hairs if that makes sense. I use it to boost signal, not so much for the built in dirt. The overdrive on the DI kinda stinks when you push it beyond tube breakup territory.
And it's true, it is not broken. It has been a great little unit for the last two years. The construction is what I'm concerned with.