I received this great Nature Anywhere window bird feeder in exchange for my unbiased honest opinion. I immediately hung it up on my glass door with my other ones. The birds found it very quickly and have been using it very frequently. It is made of quality plexiglass and the perches have a nice rubber to them that allows the birds to perch easily while they rest and eat. Its very nicely designed. I really enjoy watching the birds in my area use it and recommend it to other bird enthusiasts.