I am very happy with this purchase. I had my eye on another one of these devices for a while, but was never really sure if it was worth the price. After joining Birchbox (and suffering through a really bad breakout) I discovered the DDF and decided to spend the money. So far, I really think it was worth it. I have only been using it for a couple of weeks but I can really tell a difference in my skin-my breakout has cleared up, I do not have as many new blemishes, and my face feels so clean and smooth after I use it! I also feel that my make-up goes on and stays better but maybe that is just because I am not needing to use as much as before. I also like the fact that it comes with three different brushes (plus batteries!) and you can use your own cleanser. You do have to replace the brush heads about every 3-4 months and my only negative comment is that you can not buy them separately. The refill kit contains all three brushes and the crystals. I feel that once I find out which one I like best, I would probably want to replace only that one brush that I use most often. But all in all I still think this was worth the money and I can see myself using it happily for years.