I think it depends. For a large snake, the idea is for them to be able to move around comfortable, and be able to stretch out. Just adding an additional level above won't allow them to stretch out length-wise completely. On that, not all of those larger snakes may want to even climb up there. I can imagine others, like corn snakes or other species (or individual snakes that you know like to climb) would take advantage of that feature, but not sure about them big gals.
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