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I can't believe the old "D-Bol as a bridge" thing is coming up again! I'm positive that it is proven that using Dianabol on a daily basis has two effects:
1. It aromatizes heavily, which will increase your Estrogen levels. You would therefore need to run Nolva, Arimidex, or something to control that.
2. It's fairly hepatoxic, which means that it causes damage to the liver. I would imagine that after a few months of any serious cycle involving it, you would start to experience some serious health issues- some that might be pretty permanent. Doctors pass out drugs all the time that are liver-toxic, but the trick is that the additionally monitor the livers functions through frequent blood tests.
I wouldn't mess around with it too much, maybe use it at the beginning of a big cycle to kick to off, that's about it. Otherwise, you'll eventually be supplementing your doctors income...