I would like to suggest some changes to the Relationship classes that 123 creates.
First the friendly names are all still blank. I have posted on this before. It is confusing to the user and me as the admin.
Red is a blank 123 RC and mine is in Blue
Second it seems that the relationship classes created are Managed. This means that when you delete a header record then all the children get deleted. I already lost data due to this. I would be nice to be able to use Simple instead. Which still sets the keys to Null (bummer) but at least they do not get deleted.