Nerd is doing something completely different and it works. Instead of using harsh anti-bacterial chemicals they're using stuff like yogurt, rosemary and sulfur to keep your face clear. Instead of wiping out all bacteria, because some bacteria is good and you actually need it, they're targeting only the bad bacteria. This stuff won't give you any of the typical acne treatment side effects and it actually works.
The only downside is that Nerd products are VERY expensive. The 3 step system will run you about $200. Look out for discount codes and sign up for their mailing list as they regularly offer 25%-40% off codes.
Answer: My daughter and I both have oily skin and the cleanser works really well. It doesn't leave our skin feeling "stripped" at all. Would highly recommend.
Answer: Try the cleanser first to see if you like it. It's not too expensive and it's a good way to gauge how well your skin will respond to their ingredients/formulas.
Answer: Very safe ingredients which seems to be their biggest selling point. I also really like they use essential oils in their products instead of acids or peroxide.