I've used it twice. I'm not a fan of it though.
The first time I ran it was near the end of a contest prep. I was already shredded, but I wanted my glutes (which are soft naturally) to be striated.
I ran it at:
Day 1: 250mg
Day 2: 500mg
Day 3: 500 mg
Day 4: 750 mg
Day 5: 500 mg
Day 6: 500 mg
Day 7: 250 mg
And I believe I lost muscle in the process (though there are many who claim that DNP isn't catabolic). And I got really weak. Took me months to regain the strength I had prior to using DNP.
My training, cardio and diet remained the same while i was on DNP.
That was years ago though... Not sure if I'd run it again.