Until now! We stuck him in it yesterday and he LOVES it. He was so relaxed in it, as you can see in the video. I should have thought of it before, since he loves movement so much, but when we got home from the hospital post-'crash' I didn't think he could use it because of the vent. Fortunately, the weight limit is 25 lbs., and we still have a ways to go before then. He just hangs out of it and bounces it with his legs.
As he swung in it for a half hour today, gazing up at the soft purple stars projected from it, I was so happy that he finally got to enjoy it as I hoped he would.
OK, so here he doesn't look like he hates it, but he did. Trust me. Dakin at 4 days or so old.
And here's the boy now. See how big he is??