I was using Panoxyl 2.5 % BP for 11 years, but it got discontinued in Canada. (don't know why since it was a really good product)
I was looking for a similar product but couldn't find any where I live.
I ordered BP from acne.org and after using it for a month, i have to say i am really pleased with the high quality of the product.
I don't have an opinion about the regimen because i don't follow it,
i have been using BP for about a decade and i guess i have my own personal regimen which works fine for me.
If you are new at using BP, i would advise you too stick to Dan's regimen at first and then play with it, add other products and add or remove steps as your acne disapear.
Be careful because BP does dry your skin so less is better at first. If your skin is dry and red, just stop using it for a day or two and it should get back to normal and then start using it again.
Good luck :)