Only time you have a dusty problem with Fluorite is the first day you put it in your tank, after that there is no problem at all..
I don't like the texture and the way it holds plants.
You have to dig a hole, then hold the plant down and use the fingers you aren't using to push the gravel over to cover the roots and hold the plants, trying planting 50 Val's like this... Unless you buy black, the color is extremely ugly unless you like the color and texture of crushed Terracotta..
Sand is perfect, just push the plant in the sand and your done.
I think if you got the cash, I would recommend Eco-Complete