Man ...
I really like the Double Jive pedal. It's been awhile since I've had so much fun with a dirt pedal. It's just a different beast altogether. The single Jive is cool enough, but stacking them is when the magic happens.
You see, there are these three little toggle switches on each one. I'm not 100% sure what they do, but the maker says "three clipping diode toggles that allow you to experiment with different levels of asymmetry and symmetry" - in practice, they are pretty cool, especially when stacked. I'm gathering that each one somehow changes how the diode(s) clip(s), and you can set them for one position on Jive 1 and the other position on Jive 2.
This leads to some really cool thing - in some settings, some of the diodes clip in even harmonic order and some in odd, so you get your sound clipping in both even and odd harmonics at once. It can be dissonant, or quite beautiful. You can lower the volume of one and set the odds to be very faint, which gives this kind of distorted chorus effect, or you can set it higher for a harsher effect.
Not to mention that you can run them in parallel or serial, etc. All in all, it's a pretty cool pedal.
by no means would anyone ever describe it as "smooth" or "tube like" - this ain't the pedal if that's what you are looking for. The distortion is crunchy - it's not fuzz, it's got a nice pronounced clipping, just like an over driven console should.
@el murdoque - on your dirt bender, have you ever run across anything like that?