I bought this top mainly to sit under long sleeved tops/fancy sweatshirts as I find those types of tops look good with a buttondown layered underneath. It is really great for that purpose. It has a nice, stiff collar that stays put and sticks straight up and the end of it pokes slightly out when it's underneath most shirts. That's exactly what I wanted out of it.
Negatives - I don't think it's that attractive as a standalone garment. I took other reviewers' advice and sized up one size and that was the right decision. But it's still just ok for fit & shape. Additionally, as with any buttondown it does gap on me. But that's not unusual for me with a bra size of 32ff. It's not obscene in terms of gapping, so I suspect women who are slightly more proportional than me bust-wise will have very little or no gapping. As I'm mainly using it to layer, the gapping isn't a major issue for me.