Pros : Molds are very well-made.
Cons : Disappointed to discover my 13 x 4 1/4" channel plate mold was actually 12 x 3 1/2... quite a large difference when working with glass.
Other Thoughts : When they say in the description that size may very, take it seriously. I ordered a 13 x 4.25 channel mold – one that I already own but needed a second of – the mold that came was 12" x 3.5". This means I'm unable to use the mold with the pieces that I have cast that are 13 x 4 .