They don't deliver the right amount
I've bought this several times already, and this time I've finally cleared up my doubts about whether it actually contains the amount they say. The dispenser is for 30 doses, 1 gram each, as stated on the box—so a total of 30 grams. For convenience, I use a syringe to extract 1 gram to give to my cat easily, and after the second extraction, the dispenser had dropped to 4 marks, which equals 4 grams.
Last time I suspected it, but only realised when it was nearly finished. Now I've confirmed it right from the start.