Works, but you have to make sure you download the Samsung updates
I read a previous reviewer saying it doesn't work, but I managed to get it working. You need to make sure that you install all the Samsung updates on the Tab Pro S.
The pen itself isn't great. It's not particularly pressure sensitive, but it does the job for signing documents, which is all I need it for.
Trouble is - no other stylus works on the Tab Pro S!