Alpha, you're looking for timelines and guarantees. No one can give those to you. YES, DB'ing IS COUNTER-INTUITIVE! Have you read the books? Twice? Gone over Sandi's 37 Rules again? A LOT of it is counterintuitive, but let's face it -- our "intuitive" button wasn't working right or we wouldn't have landed on this sad beach to begin with, right?
The sooner you accept the precepts and keep on applying them -- CONSISTENTLY -- the better off you and your kids will be. No, Michele's concepts are not guaranteed to work -- no marital author's stuff is. Adults have free wills, and by the time people land here (or seek out ANY marital repair/affair-busting program out there) there is already a LOT of dysfunction going on in the marriage. I'd estimate the success rate of these programs are probably 25-35%, to be perfectly honest.
But I'd put them at 0-10% when people do nothing, or merely continue in their old ways.
The GOOD news is, when the principles are applied, even if you only have a 25-35% success rate, I've seen about a 75-90% success rate for people improving themselves, and becoming stronger, more emotionally healthy, more interesting people and potential future spouses if they're current marriage doesn't work out (and even those, something like 20% of divorced couples re-marry, with VERY high percentages reporting that the new marriage is FAR better than the old one!).