As this is my posting, I thought I should elaborate on what I have surmised in discussing this issue with my husband. Obviously, after I spent $590 on this item, for him to only use it twice, I wanted to know why. First the positive aspects: (1) Depending on how you adjust the arm straps, you can accelerate like a rocket; (2) You can do an unlimited number of passes per set. The time my husband used it, he did over twenty-four passes per set and still was not tired (with the exception of his legs). Mind you he is sixty-two years old and usually only does ten passes per set due to fatigue. (3) If you suffer from back pain at all, this is the ultimate answer. As for the negative: The only negative aspect I can address is the fact that since my husband weighs 235 lbs and skis on a 66 inch ski, he gets excessively pulled forward when coming out of the water, causing the vest to pinch him on the left hand side. He wants to a 68-69 inch ski, which is what we are going to use the proceeds from the sale of the PowerVest towards. It is true that there are no return policies on the PowerVest, which is why we are offering this one for $115 less than we paid (not including the expense we are going to incur for the out-of-pocket free shipping we are offering). For those wondering about the sizing, my husband wear a XL in HO life vest, so I would say that this vest runs true to size. The back from end to end is approximately 23.5 inches. It is fully adjustable. Any questions, you can phone my home at (407)240-2550 and I will let you speak to my husband. We have been very involved in the water-ski and wakeboard community for many years, with our daughter being a pro level rider. Our reputation means a lot to us, so I am in no way trying to mislead anyone.