I've used the acne line for years. It's easy to get caught up in their constant barrage of "new and improved" but I think it works really well.
The kits can be good deals, and a good way to try new items. They always have a nice freebie make up bag or purse in the kits.
I use a lot of different items, mostly the glycolic cleanser, clear-zit, dry-lo- it is great for occasional break outs, and I really like the oil free moisturizer and Reflections shampoo.
If you want to try it inexpensively, you can usually find most of it on E-Bay.