Once I tried the trail HF10 help my right leg but not my low4er back...so I went on to get the device in...docs say it will better once in. So I did. Right now I been thru step 123 now have to get a upgrade 456....I can't work around the shop or even fold the clothes have to sit down...I'm ready to get this out..they have me on the lowest dose possible and that doesnt help just knock some of the dust off some...hope others out there have better luck....