Pros : Very versatile for any craft. Very cool with lights inside and transparent glasses on the outside. I made a birdfeeder out of mine, by drilling holes in the bottom part of the block using a diamond hole saw and a container of water, decorated the outside with glass and copper wire and won Best Project for Any Skill Level as well as Diamond Tech Crafts Favorite in the recent Ring of Fire Artists Challenge. This was the first time I ever used this product and it ROCKS!
Cons : None I LOVE THIS PRODUCT!!!
Other Thoughts : A round shape with a flat bottom would be cool, something similar to a gold fish bowl.
Pros : I used iridescent transparent glass to make flower mosaic on front. Plastic insert was already cut in coin slot. Used diamond grinder to make small adjacent hole and dropped in night light. Grand-dgtr. loved this combo night-light-bank for her bedroom
Cons : Plastic insert doesn't always fit well and requires some grinding on opening. Minor problem.
Other Thoughts : Without the plastic insert, makes a beautiful vase. Would have rated a 5 but my new blocks do not have coin slot, just a small hole.