Pros : It is the perfect size for a small heart.
Cons : The first time I had some trouble with priming the mold. The Boron Nitride did not evenly cover the hearts, and when I took them out of the mold, a few of them had boron residue on them. I cleaned off the mold, and reapplied the Boron Nitride. The second time, things worked much better. But on on of the hearts, the primer was crackled, and so I didn't use that heart. All the the others came out perfectly.