I've used it and I like it. It's the best developer for Ilford HP5+ that I've found. Now that it's available again, I'm going to buy some. I have the formula -- or what purports to be the formula -- that I found several years ago on a german website, but I'll pass on mixing my own and just use the pre-packaged. FYI, it's not like Rodinal - much finer grain, different look. Try it, I think you'll like it.