I've bought their grunge before, or gotten it free with orders, either way, I've had it and it's ugly.
It's got a lot of stuff in it, as in, it's truly functional as what they are selling it as and based solely on that I would certainly buy it again, but they use a sort of medium sized grain for their rubble and it's all covered in coraline, so it looks like pink and purple kitty litter. That's really not so bad if you consider why it's pink and purple, but to make it truly obnoxious, they throw in a whole bunch of really unnaturally colored shells, like neon green and hot pink -- the exact kind you find in goldfish bowls.
The color eventually wears off the shells or they get moved around or buried, so the greatness of hot pink and green mini-shells only lasts a couple months to a year, but it's something to think about if you're planning on using it in a show tank.
That said, if you find a sweet deal on dry sand I'd totally go in on it, I'm needing/looking for about 50 pounds more.
Depending on how much you need there was a guy on ebay that was selling live sand and he told me he'd sell dry sand also, but there wasn't much of a discount, either way it was a reasonable deal - 30 pounds (live) for 16.95 plus 9.99 shipping.
fwiw