I wore the Orthofix Bone Growth Stimulator in 2004 and again in 2006. I have to say the first model was huge and uncomfortable. The second model was more like a necklace and I managed very well. Each time I had to wear it 4 hours a day every day for 6 months. That was easy enough because I took it to work with me and by Noon I was done wearing it for the day. And even though I was fusing at 3 months my Neurosurgeon wanted to see a "solid" fusion hence the 6 month mark. I swear by them and my insurance, BC/BS, covered the entire cost both times.