Spinal Cord Stimulation

Has anyone had a Spinal Cord Stimulator implanted?
My doctor is recommending this procedure for lower back pain after trying everything else. Injections didn't work. Going to a chiropractor hasn't helped. Medication only helps somewhat. I really don't want any kind of surgery. I have a tens unit. Sometimes it helps with the pain sometimes not.
Just wondering if this really works? Pros and Cons?
Interested in other peoples stories/ thoughts.

Susie