Pros : This mold was so much fun to use and so easy! I found the best result was using a solid piece of glass with a hole drilled in the middle, rather than cutting the circle into 4 pieces. Glass placement doesn't have to be exact. I did one with solid glass ocverage and one with mosaic pieces 1/2 irr up and 1/2 irr down so I could see the different effects.
Cons : Instructions talk about using irridecent glass and the different results of using it up or down. This was confusing to me because it was my first lamp attempt. I called delphi and they explained that you can use regular fusing glass and the irr glass was only an option you could use. Firing takes a long time for both steps. Lamp shade isn't very long.
Other Thoughts : Have fun! Perfect way to use scrap glass!