I used a snuggli with my first babe because she HATED a sling. She was very long and liked to be streeeeeetched out. She's a very tall, straight, strong little lady now
I think it's very AP, and as long as it's not used on a daily basis I don't think there is too much to be concerned about. She'll be hearing her daddy's strong heartbeat, and I'll bet he'll have his protective hands supporting her back most of the time as well.