I previously had a Sansamp BDDI and a Paradriver. I wished the BDDI had a mid control and wished I could get some more highs out of the Paradriver. Then I tried the VTDI and it's perfect. You can quickly get a great SVT-like tone that helps you sit in the mix perfectly. I've played this pedal in stadiums and bars and it rocks.
Tech 21 Sansamp VTDI
a preamp di pedal designed by TECH 21 to simulate the sound of Ampeg's amplifiers throughout the history, from B15 to SVT Demo by me here: