Yes, it is good when you have trouble keeping humidity high enough. It absorbs water, and releases it somewhat gradually. But it will dry out. And then if you need to bring humidity up you can soak some of it in water and put it back in the tank. It will then release moisture and bring humidity back up.

It's a fine substrate for garters with a nice natural look, albeit rather expensive. Finely shredded aspen or carefresh works well too and is cheaper. You might want to look into getting substrate online. It's significantly cheaper even after shipping costs. Just shop around.