Pros : Lovely heart shape. Great if you just want to do one in a small kiln although 2 will fit.
Can use all the left over bits up with some fun effects.
Cons : No instructions but they can be found on the net.
Trial & error in working with melting times but slow ramp prevents bubbles and mold cracking.
Other Thoughts : I use shelf primer with no problems. Coated 5 times first time and then 2 every time I use thereafter. Never had any sticking issues.