~Yes, I put a hold on it at my local library and read it through last week. Before that I perused the forums at the site Ceashels posted.
~I checked these out in store and the differences between the kit and homemade are that the kit has thin side walls(looked about 3/4 inch to me)and decorative corner posts. If you just plan on flowers or herbs or need it to look extra pretty than go for it. But sturdy 2"X6"X8' lumber boxes are cheaper in comparison and will hold up much longer. I don't think the extra SFG things like cold frames and lathe grids would work well with the kit because of how much less sturdy it is.~
~It's mined in areas where governments control the process. I believe the occurrence of asbestos in one of the mines has greatly hindered the mining.
Vermiculite is a mica rock. Out in the sun it looks like sparkly fool's gold. It's really light and lovely!~