Looks good and should keep mice out when closed. Metal wont get chewed ether. Pricey??? YES.. There are very cheap versions of feeders that you can make yourself from a 5 gallon plastic bucket and a 3 inch PVC elbow. Total cost under $10. I CAN FIND THE THREAD FOR YOU IF YOU WOULD LIKE MORE INFO..
WISHING YOU BEST
You are correct in your assumptions. Here is a link to post that explains need for other in mixed flocks. There are multiple feeders in use.I've never used one, but what about young birds? Bantams? Young bantams? I'd think that they wouldn't have enough weight to open the feeder. It sounds good for larger birds, but not the littles.