I use the makeup optional kit for congested skin and I love it! I've been using it for about 2 years now and have actually converted quite a few friends and family members over to it. (Too bad I can't be a consultant for them!) I don't have experience with the acne skin kit so I can't give you any insight on that!
I do however highly recommend the set on philosophygirl.com. They offer a great set at a great discount. It is set up to ship every 90 days but if you find out that you need it more frequently, you can change that too. I realized that I actually needed it less frequently so I had them change my ship date to every 120 days.
Good luck! It is a great product!