when or how often does it sync with other people, I share this list with my wife but she doesn't seem to get all the updates i added within the last few hours.
Does it only sync with icloud (when connected to wifi/charging)?
Hmm.. I have never thought about this but yeah the behaviors are different. In Notes if you check it off it falls down to the bottom. In Reminders if you set to Hide Complete it will be gone.