B&G Macaw, Galah, 5 cockatiels, 50 billion and a half budgies. We breed and do rescue. Too many to list each individual's name and age etc, but they are each individuals and loved dearly.
I have one of the first one noodles linked. It works fine, but it is not built solid sturdy or anything. You will need to tighten the bolts now and again in our experience. It does have lots and lots of space, though. 4 budgies would certainly feel comfortable in it.