actually, when I first was deciding to get one, one member said just do it, (at that time there was a 13 day wait), because if I didn't like it , for the $ , I could prolly get all of it back from someone who would want it from me in 3 days. It does have a learning curve, for instance how high the tether should be , what diameter the tree should be and the first 30 min. I used it I hated it. . It was uncomfortable, felt like I had barbed wire around my thighs, then I learned if sitting, you really need to rest your feet on some kind of platform. and seemed i did an 30 isometric with it. ( I was also very non- confident in the equipment being a stand hunter), This was a 4 day hunt. I decided I needed to be in a little bit larger tree( about the size of a basket ball), and it made so much difference that on my last hunt, in the morning, I almost fell asleep. go to you tube