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The Double Drive is a cool pedal. I had one for a while. I could get a great Mesa Boogie Mark series tone out of it through my homebrew 5E3 amp.

I've got a couple DOD FX50B Overdrive Plus pedals, and I like them quite a bit. They are kind of noisy for an OD pedal, so that disqualifies them as my favorite.

FWIW, the DOD FX51 Juice Box is...

My favorite:

http://www.bossarea.com/images/OD2.jpg