-As many have stated, the mold dries impossibly fast. It takes less than 1 minute to solidify, even when following the instructions exactly. By the time you even pour the mold into the tube, it will be almost solid. That doesn't include getting/maintaining a *****, nor the insertion.
-The tube that is used is very cheap plastic. (The kind that makes opening items annoying). You have to work hard just to ensure the tube doesn't cut you during insertion.
-The molding material can give an infection. It gave me an infection, and I have no known allergies to any type of rubber (Or any solid material).
-The vibrator is basically there for show. Unless your circumference is more than 10 inches, you will have trouble even getting the vibrator not to break the silicon. (This I could not test, but math says this is true).
-They sell "Refill" mold material. The point of this item is not to make a lone of a person's *****. The point of this item is to force you to buy and waste as much material as you can, gaining the company profit.
-NOTE: I spent nearly 2 hours preparing for this, because I had read about the mold solidifying fast. I had the pan and spoon ready, had marked a line in a different color on the measuring cup to make quick filling easier, had measured the water many times, had **** running to ensure my ***** stayed at or near an acceptable size, and was very quick and efficient in my attempt.