I love SD as a tool in flight and can't imagine flying without it these days, but all those that know more than me say that I should still be flying with a chart as it will let me down one day. The thing is I carry an iPad and a phone so have backup.
If I fly with someone else I always pull out the paper chart to try and keep myself sharp, but there is no way on this earth that I can be as certain of my position though as I am with GPS and SD.