A traveling reptile show (that has over 20 reptiles all the way up to 20 foot pythons) has taught me that rabbit pelets are good substrate. the reptiles can get comfortable. Poo is easy to scoop. there isnt the gut threat if it sticks to food and gets eaten. no dust in the big bag i bought. my bosc can dig and make what it wants out of it and our humidity of 50-65% does not bother it. Misting makes it flake a little but not much. It has awesome ambiant heat dispersal as it allows pretty even heat thruought it. My bosc loves to rub its face after eating and gets none in eyes and it doesnt stick to its face. It also "sand submerges" in it in the morning in it streching legs out comfortably.. My herpatoligist buddy likes it way better than sands and some wood/bark. I figure its not good for high humidity reptiles as it could mold. But for desert and mid humidity level reptiles its been good. Now, I want your thoughts and opinions.