I have cooked chicken in mine before. I had a lime steamed chicken recipe. If was very tasty, but the chicken came out way to dry. I won't try that dish again, but I am sure I have learned some lessons and could get it to come out better if I wanted, I just don't care to bother LOL.
I like bamboo over metal for a few reasons although there are times I like metal better (I can't think of any at the moment, but I know there have been times). I like bamboo because it does not heat up like the metal. It truly is the steam that is cooking the food, not the steam and the hot metal. I also like the bamboo ones because you can fit a lot more food in. Just stack a bunch of bamboo levels on top of each other and let the steam rise and do the work. I also like that you can have fish in one level and veggies in another. You can't really do that with those metal baskets.