I got the system and it was delivered very quickly. The instructions are very easy...brush your teeth, paint your teeth with the serum, put the mouthpiece in, and plug it into your phone or computer, etc. I was, of course, skeptical but I noticed results after the first use. I assumed they would just go away as soon as I drank something but they haven't and with every use, my teeth have gotten whiter. My bottom teeth are always hard to whiten and they are pretty close to where I want them to be after 4-5 uses. I grind my teeth so they are really sensitive but this system doesn't bother me at all. As long as it holds up I would definitely say this is well worth the price. I'm very happy with it and my white teeth.
Bottom Line: Yes, I would recommend this to a friend