Alot depends on what type pain you are dealing with.
I too have used the Fentanyl patches for about a year now. I have nerve damage to both legs. The patches are wonderful for pain relief, however, in my case.....like with most opioids, my tolerance will continue to go up and I would need more and more of this powerful med.
The expense of the patches, plus the side effects and long-term effects (such as depleated hormones, etc) lead us to the option of getting this device.
When we have a chronic pain issue that surgery won't help, the Dr. may suggest the SCS. There is an evaluation to take to make sure we are a good candidate. If so, there is a trial period. If the trial proves effective, then the permanent stimulator is implanted.
The SCS is not a cure, nor does it get rid of the pain. It simply 'covers over' the pain with a soothing tingling sensation. Many people are able to back off the pain meds considerably. Breakthru meds are possibly still needed however.
There is a new forum specifically for SCS and pain pumps at the top of this forum under the 'stickies'.

Let me know if you have more questions - feel free to send me a PM or simply post on the SCS forum and you will get good feedback from others with these units.

Rae