Instruct: Classify the given Amazon review as either positive or negative.
Query: Very happy with this purchase

I bought this for my son's 6th birthday and it was definitely a hit. He loved making the potions. I had to help him but he finds it very exciting. He loved making the wand the best (which I had no trouble putting together). It is teaching him measuring and fractions (fill test tube a '1/3' with water etc), and also some science too (the density of oil vs water etc). It is so great I am thinking of getting it for my nephew for his birthday - and he is 8. The only reason it is not 5 star is because storing the left over bits and pieces is messy, and I'm not sure you can get replacement ingredients easily.