As in, being them, or being yourself and living their life for a day?
I wouldn't want to trade with anyone if I was me. I'm able to understand where people are coming from and "walk in their shoes" just fine.
However, if I could live a day as someone else, I would want to live a day as each of my boys so I could better understand how their Autism effects their daily life. I think it would make me a better mother if I could really experience what they go through.