I am 3 months post op from my Algovita install. I asked for a reprogram and got it yesterday. They sent a new man. I told him my lumbar left was the issue I've been dealing with since my 2001 surgery. He set up 2 high frequency programs and 1 tonic. I asked for a 2nd tonic and he gave me one. All 4 target mainly lumbar L/4/L5 area. He did not have to ask me whether the vibrations were stronger on my left or right like previous Nuvectra reps. He knew right away. I was very impressed. One tonic feels like a Harley Davidson revving. The other feels like a slow machine gun. I did have what I called high pitched vibrations that I did not care for. I need a low and tough punch to my back. The 2 non paresthesia programs also mostly eliminate my lumbar pain. He also said the unit is safe for MRIs and it should get the official FDA announcement in a couple of months. This was great news to me of course. I have DDD and bulging discs from top to bottom. I seriously doubt I've had my last serious spine issue.