I've heard it is really messy and fine grained, plus over priced. It looks great though.
Theres a seller on ebay called specialty grit co, which you can get nice black sand for about $1 per pound with shipping. Not sure if that is cheaper or not.
My experience ends that it is way to pricey for my tastes. For that price I can get black flourite sand which helps me grow super neato plants too. But it does look nice, and I know a couple of people who got it for the same reason you are looking into it... the ever elusive 3m products...
I have it in my 220. I don't rememebr what I payed for it. I bought 13 bags so he gave me a good deal. I think I didn't want to even look. I think ti was around 210. SO maybe around 16 a bag or something like that.