Hi Randy, I've used cypress quite a bit.
It's attractive, holds humidity well without growing mold, and can even be used relatively dry. It's also easy to spot clean.
However, even though I've used it for years, I still worry about accidental ingestion. As much as possible I try to feed off of plastic trays or some other sort of barrier. Still does not protect the snake that graps a thawed rodent and drags it elsewhere.
If you're the type who prefers separate feeding containers it's an excellent choice. If you're the type who individually feeds and observes each animal it's a good choice. If you only have the time to toss rodents into cages and check back 24 hours later there may be a small risk.
For my collection and the species I keep I'm probably going to switch over to the compressed bricks of recycled material that you soak in water to re-expand. Honestly, it's more for my peace of mind that actually believing cypress is unsafe.
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Current snakes:
1.1 Gonyosoma oxycephala - (Silver/Yellow)
3.4 Gonyosoma oxycephala - (Green)
2.1 Gonyosoma janseni - (Black)