Did/do you use one? I never did with any of my kids. I always thought it was like a cage for babies. DS5 saw his cousin in one and asked when she could come out of her cage. Lol. I never told my kids I thought of it that way. It was the first time he had seen one and he is the oldest of 3.
ETA: I should add we co-sleep and rarely travel. I can see using it in some circumstances but my cousin abuses it and my neice was neglected in it so I just have very negative opinions of it. I know none of you momma's do that and I'm sure use it correctly. ;-)