I've had some of their ferret/rat/hamster cages and used them for rats (the hamster one was a hospital cage for an elderly rat whose movement was limited). They're good cages, expensive but well-made, sturdy and with some nice feathures. Their locks were particularly thoughtfully designed - lots of cages for small animals have rubbish locks that the rats would have figured out in no time, and indeed mine would let themselves out of a Liberta cage until I added extra clips. I don't know what their bird cages are like, but if they're as good as their small animal cages you'll be fine.