Pros : This looked like a great way to use up scrap glass and get a cool one of a kind piece of art. It does do that.
Cons : Like the others, my mold cracked, and though I can probably use it again, it is going to have the dark purple glass mixed in with it, so I pretty much have to use that color in some way. The directions are rather poor. They do not mention the "stem" you get that connects the mold to the puddle of glass. I had to fuse three times to get the stem thin enough to cut. I was worried about breaking the mold, but later noticed it had cracked anyhow.
Other Thoughts : I agree using a flowerpot makes a lot more economic sense. I like the glass, but the mold isn't practical. I have the other two and will likely return them for something more useful.