This is a great program--I'm sure anyone who sticks with it will see major progress. I started it a while ago and then tapered off toward the end, which I shouldn't have done because I think I would have had my splits if I'd just kept at it.
Even so, I went from being several feet off the ground when I first started, to being just a couple of inches off the ground on my good side. I have been about as bendy as a plank of wood my whole life, even as a teenager, so this was pretty much monumental progress. I've been doing it again these past few days or so, and I can actually touch the ground now--I can't just slide straight down and touch the ground, but if I slide down as far as I can, then do some of the isometric squeezes the article talks about, I can actually go all the way down into them with only mild discomfort, so I'm sure in a couple of weeks I will have them all the way.