I've had my scs since 2003. I've had 8 back surgery's and 2 two scs surgerys. If it wasn't for the scs, I wouldn't be able to walk, work or exercise. Unfortunately I now have the Thoracic problems with disc, which this unit does not help. Mine controls both legs, and lower back. The arachnoiditis I suffer from is almost painless, unless I totally over due it, due to the scs. If I don't have it on, withing 1 hour I"m in a level 10 pain. So yes, this unit is wonderful.