We currently have an AD import running, incremental every night,
full import every Saturday night. At the moment, we still don't
have all the info in Active Directory for each user yet (i.e. first
name, last name, phone, etc...we just have the domain account name
and the preferred name for each user in AD at the moment). For the
other information, all the user information in SharePoint is entered
using the SPS interface. I know that once the full AD import kicks
in, it wipes out all the information in the SharePoint user profiles
that are mapped to AD, since they are mostly blank fields. But yet
when all the information is still in the profiles on the SharePoint
end, the user that doesn't show up in the Manager's My Site still
shows that the user has that same manager in THEIR My Site.
Hopefully this isn't too muddy, it's a task on its own to explain
something without visual aids.