I love my PMD Personal Microdermabrasion Device. I had been using the green discs for moderate abrasion because I didn't want to harm my skin, but, because I don't have sensitive skin, I soon moved up to the very coarse red discs. What a difference they made! I love them, and they didn't irritate my skin at all. (If you're just beginning microdermabrasion, however, I would advise beginning with something delicate or moderate to see how your skin reacts.) Like some of the other reviewers, I thought the moderate discs were doing a good job, and they were, but the red are vastly superior. They remove many more dead and dull skin cells, and, additionally, I use them on my arms and legs as well. My skin does feel a little sensitive after I use these, and I would greatly advise investing in the cleanser, toner, and recovery cream especially made for use with this device. (Skin is less sensitive than it is after dermaneedling, however.) I usually use this device in the evening, and the next day, i go lighter on my skin care routine, still using the PMD products and of course, sunscreen. Your skin will be more vulnerable after one of these treatments, even if you don't feel any stinging at all. Go easy on any products containing acid, especially glycolic, which can make you far more susceptible to sun damage. I do use a glycolic toner in the morning, and a glycolic resurfacing cream at night, but I wait about two nights after using this device to do so. This device, and these discs, have really improved my skin. I have no discoloration, no visible pores, no superficial lines or wrinkles. This device has helped me develop the coveted "glass skin" face. My arms have lost the "sun freckles" I developed a few years ago, due to lack of sunscreen (won't make that mistake again) and they, too are very smooth. None of those little bumps some of us can develop. Just arms as smooth as silk. This is the only home microdermabrasion device I've found that can equal a salon treatment. It's so easy to use, and it's so convenient. It's always ready for me, anytime I want to use it. No scheduling appointments, no drive to the spa, then another drive back home. I can pamper myself right in my own brand new bathroom, which was designed to contain a mini-spa. I love it! I really love the fresh, radiant, glowing skin this device gives me. But, you do have to use it twice a month to keep the glow. Believe me, the few minutes it takes to use this are certainly worth it. (Keep the device moving, don't hold it in one place.) I use this device twice a month, and will continue to do so. And, I may buy the discs that are made especially for the body to use on my arms and legs. In fact, I know I will. I've never been disappointed by a PMD device or product yet, and I don't believe I ever will be.