I've not used White Diamond, but I have used Black Hole which is similar except for the fact it's designed for dark paint.
I really liked Black Hole and it made my car look amazing for a short period of time. The nice thing about those glazes is they can be topped with a sealant to provide protection for the paint.
If you are looking at glazes I feel the Poorboys product offer the most filling. I've also used Prima Amigo and it fills less but supposedly has a bit of abrasive in it which cleans and preps the surface better for a sealant or wax to be applied. I've used both and was pleased with both.