Coming out of retirement from posting just for this... I am a member of DSC and think its absolutely well done. I have been a member for two years or so and their product is good... really, i just love their marketing and the idea and it does feel a need for me and it's worth supporting.
Their customer service is excellent (i wanted to cancel a shipment that was already in process and they were unable to do so in their scheduling, but made it so that i wasn't charged).
The only issue i see with their service is just my own behaviors. Sometimes i use a razor, sometimes i use a trimmer. As a result, i have a few extra cartridges.