I've used everything from Eco Earth, ReptiChips, American Excelsior aspen, Zoo Med aspen, All Pet aspen, Plant It Grow IT coco husk. And personally i went back to aspen for everyone. Plant It Grow IT would be my second choice. Works well for my boas except they tend to bury their butts in it and poop or piss so trying to find a poop or piss is a challenge. Nothing quite like sinking your finger into a semi chilled pile of urate.

With all that said, i prefer aspen. It's easy to spot pisses and poops on especially for the retic and using AP cages, i dont have humidity issues. Plus it doesnt start to get a wet smell i got with all the coco stuff. AP cages hold humidity VERY well so my biggest problem was the stuff was either too wet or too dry. I couldnt get a nice happy median. With the aspen, it's easy to get 70% without overdoing it.

@redshepard- where do you get your Teklad stuff from? You order the big 7 cu ft bails?