I know that when I was younger, when I started using ProActiv my skin cleared up a lot, and my acne was pretty darn bad.. and I made it worse by picking at it (OCD thing, I pick at any scabs, blemishes, etc.). However, at around the same time, I started using BC pills which can cause your skin to clear up as well. So I really don't know what caused my skin to clear up. Now, however, I find that my skin responds best to a very gentle cleanser, like Aveeno (I use the skin brightening daily scrub), that's not even made for "skin clearing" or acne.. basically no medication in it. I don't know if my acne went away or if the less harsh products are better for me, so I guess I'm not a lot of help. I know that when I used the harsh products with high amounts of benzoyl peroxide (like Oxy pads), that my skin was way worse... dry, irritated, and just as pimpley.
The information I can offer is that if you don't want to use all of the steps of the ProActiv system because you find that one doesn't work for you, you don't have to. I used only the cleanser and toner because the lotion made my skin too dry and itchy, and I was always running out of toner before everything else. My mom called them and asked if she could switch the lotion for another bottle of toner on the auto delivery we had, and they did it, no problem. Also, I only used it once a day when I would take a shower, so my mother and brother also use the same stuff because we had created a huge backlog of unused cleanser because it took me way longer than a month to finish it off. So if a couple of people in your family have acne, it might be possible to share a subscription, depending on how much you use and how often.
Okay, I'm going to stop rambling now.
-Lindsey