I have purchased many things from Spangler science. Many of the items are great, like the giant test tubes, baby bottle tubes, slime, water polymer crystals. The items I thought were not good usually were the kits. I just ended up throwing some of them in the trash. I found that the websites was not user friendly. It usually takes a number of tries to find what I am looking for even though I am a repeat customer. Also on one of my orders an item was missing and they gave me such a hard time, finally said they would send me a refund because the product was no longer available and I never did get credited. Also, no matter how large your purchase they always charge shipping. So I do continue to use them for certain items, but am very hesitant to try anything new.