I have had a implant for 11 months - Saluda. I have always since implant put in had pain from laying on insertion point of the leads, and where the battery is located after laying on my back for more than an hour. It stopped working about 5 months in, had the implant re-adjusted many times, and finally going to have it taken out on Monday! I was told I felt it more because I was 'skinny'! I am actually about the correct weight for my height. I could have put up with discomfort IF it had really worked, as I really wanted to get off my heavy duty drugs.
But you try these things, sometimes you get lucky other times not.