I give this product an 8 because I know of two people who have used it. I bought it for my son who has severe acne; it didn't help him much but it didn't hurt either. Another friend I know bought it for her daughter who had mild acne. She said it made a huge difference in her teenage skin and loves the product. Effectiveness As stated in my overall review, I only have experience with this product regarding two people. One with severe acne and the other with mild acne. The one with mild acne had much better results than the one with severe acne. Ease of Application This product is pretty easy to use. There are only a few steps. It easily rinses off and the cream goes on smoothly with very good absorption. Convenience If you have the time to go through the steps, this product may be a good choice for you. It is an easy routine and you can even do it in the shower. The pumps are metered so you get just the right amount. I would say it's very convenient. Side Effects I don't know of any major side effects. Sometimes it makes you have a tingly feeling but I believe that's normal. Immediacy It may take a couple of weeks to notice any difference or how well it is working for you to give your skin a chance to 'renew'.