I did a trial on very late December and had permanent one installed on 1/27/20. I have had great luck with it and it definitely gives me significant relief from severe spinal stenosis pain which exhibited as sciatica in my lower back and down my leg to foot. I have been very happy with it! I weaned myself off hydrocodone. If I take it now, I take it for my neck and only half doses. I have even been able to drop use of aspirin and ES Tylenol.