I have had mine for years and it is still going strong. I am buying a second one because I am currently deployed and want to ship my stuff home. I will have a new one waiting for me when I get home to use in the gym. Awesome quality product.
I am a 34" waist and I went with the Medium belt and it fits great. My suggestion would be if you are a 36" or larger waist go with the Large. The belt is fitted nicely and does not pinch.