I've never run SP's DHB, but have several others. For me, it is exactly as you describe--I might get a tiny bit of soreness later on day 2, but day 3-5 is when I really notice it and at times it can prove significant. I typically do not get PIP unless it has guaiac--but with DHB I always get some level of PIP, and always a few days after and typically improving but still noticeable by day 5.