Here are some user reported problems with Samsung Smart Switch. Except when you try to use Kies, it tells you to upgrade to Samsung Smart Switch.
Several users report calling their mobile provider only to be told to use Kies. Purely designed to move content between and old and new device.” “Does NOT allow you to sync phone content with Outlook. “NOT a replacement for Kies 3!” writes a reviewer on Google Play. So far, the sync software has been hit or miss. The purpose of Samsung Smart Switch is to help people transfer all of their old phone’s data and apps to a new Samsung Galaxy S6, Samsung Galaxy Note 4, or other Samsung phone. Anyone who tries to use Kies receives a notice indicating the software has been upgraded to Smart Switch. Samsung may have realized it had a problem child in Kies because the company replaced it with Samsung Smart Switch.