We have Bamboo in our coop as well as branches and the birds roost on it just as much as the branches. No problems so far.
Whether or not it's a good idea depends more on the size of your birds, and how cold your climate gets. A chicken's roost should be broad enough that their feet (especially toes if it gets cold) will be covered by their own feathers while the bird is sleeping.
I have two fat pieces of bamboo for daytime roosting, but heavy wooden dowels in their "bedroom" lol!! So far they haven't broken the bamboo but I laughed for days over whoever posted about their fat chickens breaking the roost they were all sitting on!! That image just cracked me up!!!
