"I know animals can be...selective. I can tell you that I placed this perch my bird's favorite spot in his cage. He rejected it immediately. I believe he was thrown by the varied widths of the perch--he's had manzanita perches with different widths before, but the "wonky" nature of this perch seemed to bother him when he first stepped on it.
It has been in his cage for months, and the only time he stands on it is to get to the treat box--it is unreachable any other way. Other than that, he avoids it. He has rejected items in the past, but not with the level of avoidance he's show with this perch!
I have a Green Cheeked Conure. I first bought the medium perch based upon the descriptions on this site. After looking at the width of the perch, I took it into the local store to get the small--the medium is more appropriate for mid-size conures than the smaller ones.
I'm sure some birds will love this perch and benefit from it, but if your bird is skittish or tempermental about new items, I'd think twice about this perch. It's an expensive mistake."