I've used Eco Earth and had good results with it with one exception. A mold outbreak in my M balfouri enclosure might or might not have led to fecal impaction and death of the spider. I was researching better alternatives. Currently for my Versicolor I'm using vermiculite and nothing else. Aside from cushioning the T in a fall, it serves no other purpose. An arboreal doesn't need to walk on the ground a whole lot anyway so the issue of Ts not liking to walk on it isn't an issue. I'm contemplating going that for my P striata as well. I just wonder if it's worth the risk of removing and replacing her from the enclosure. Pokies aren't removed and replaced unless there a pretty good reason for it. For my terrestrials, I'm thinking about going with peat because it's mold resistant and can retain a bit of moisture. I haven't decided if I'm gonna add vermiculite or eco earth to that. There seems to be a lot of variation on that but few really hard facts. I got a bag of peat from Amazon that has no additives of any kind for $8, which is a few dollars cheaper then bagged eco earth. Currently everything is on straight eco earth. The one exception is my P sp machala which is on eco earth with some sand mixed in do the moisture will drain to the bottom a little better. I refrained from vermiculite because my L Klugi hated the mix of that and eco earth even though it was only 20 to 25 percent vermiculite.