Has anyone used this stuff? I just tried my first block and I'm hooked! One block expands a lot and holds about five gallons of water. It totally eliminates all smell, it puts a weird smell in my snake room, smells like a jungle! I've tried aspen, cypress mulch, Coconut husk Grow-it and newspapers and paper towels. Nothing holds a candle to this Reptichip stuff. The GrowIt coconut fiber is totally different, it looks like the waste product left over from making the Reptichip, it's not even close in comparison, it's cheaper but I won't use it again. I would suggest that everyone try a block of Reptichip, I just ordered two more blocks on Amazon.com and with prime it's $22.95 with free shipping. I've heard that people only have to change out their substrate every three months with this stuff! It's a bit expensive up front but seems like it would save you a ton of money and work in the long run. Plus my snakes look amazing on it! I'm totally blown away...