I hadn't heard about this pedal until sometime in the last 4 months when i was watching some JHS pedal videos & Josh was talking about preamp pedals. After much extensive research & also coming across an older model back in Ottawa, i bit the bullet on the reissue of recent years with the LED & 9v BOSS barrel adapter input type. So my review is of this one, not the original late 70's gray box, or 80's yellow box issues.
Build quality is great, switch is sturdy, great gold flake colour. The few key differences between this & the older models are: Blue LED light, BOSS barrel adapter rather than the 1/8" of old, & aluminium box which makes it lightweight compared to the Zinc/steel? of the older generations.
This reissue model, now discontinued for a while, is according to some, a recreation of the first Grey box DOD 250 using the same LM741 Op-amp chip, though giving it fundamental updates such as the LED light. It's a pretty straight forward pedal with a Gain & Level Controls. It can be used anything from a nice clean boost to a dirty crunch to full on driven rage. At first, i did think the lack of tone would be noticeable, but this pedal doesn't need a tone control. & as i run an MXR 10 band EQ before it, & an MXR Bass D.I. + after it, they become the DOD's tone control, albeit very elaborate. I use it mainly as a boost with my Bass D.I.'s distortion which is set to a low end grunt, the DOD kicks it up a notch, tightening a little of each frequency at hand. It's also a nice stand alone pedal, & it's an always On effect in my rig. This has promptly replaced my MXR Distortion III in my rig.
It's very responsive to pick attack intensity, Depending on it's gain is set. Anything from noon & below, if you play light, it won't distort & stays relatively clean. As you start digging into your instrument, it breaks up nicely, giving an almost Tube-esque vibe, which i was certainly after in some regards.
Definitely recommend at least trying this pedal out. It's a classic for a reason, & i think i hear why. Works great on guitar, as it does on bass. It's versatile, simple, effective, & as blunt as it can be.