>   rsync <options>
>   if ! $? ; then
>     echo -e "\nrsync completed successfully!\n"
>   else
>     echo -e "\nrsync failed!\n!"
>   fi
BTW, it's legit (and sometimes clearer) to do it like this:
   if rsync <options>
   then
       echo -e "\nrsync completed successfully!\n"
   else
       echo -e "\nrsync failed!\n!"
   fi