I hope this isn't a silly question, but I am truly curious and confused as to why Laptops are ok to use but shield boosters are not? I did a search for shield boosters but couldn't find any answers. Wouldn't the top of the child's body still be unrestrained? I did a search on Google for pics of both and they look like a similar setup to me. Someone I know has one and I want to get a better look to see what kind it is - not sure if it's a Laptop or not.