I totally forgot to mention.. The main reason I tend to prefer Kaizen to Sego is that Sego is not a soap that likes to produce volume quickly. I find that I have to use up to 1.5x the product compared to any other soap to get the same kind of lather. It really isn't that big of a deal, but when you're considering value and cost per shave, it does add up. For me, Kaizen takes little product and makes high structure lather effortlessly. Again, YMMV.Forgetting all of the ethical dilemmas (buy what you want, don't buy what you don't want), I too prefer A&E to ZM. Kaizen seems much thirstier and denser than Sego, and overall, just a better lather. Sego might be a bit creamier and definitely has better post-shave- almost to the point where it is greasy. Like all things in this hobby, YMMV.