Hello and Welcome to Neurotalk!!
I myself don't have an SCS but many of my friends with RSD do. Everyone is different and some people swear by them and some people say that they don't work.
Here is the link to the RSD forum, many people there have SCS's so I am sure they will be more than happy to answer any questions that you may have.
http://neurotalk.psychcentral.com/forum21.html
I wish you the very best of luck with the SCS and I really hope it helps you, please keep us all updated when you can!!
Alison