I use the Fellowes on my chair at the office, which had terrible back support and is now significantly improved by this product. I have three issues: 1) The back support tends to slide around a bit, unless you are ultra-precise with tightening each of the elastic straps in the right proportion to the others. 2) The middle-center section of the product doesn’t provide enough support. This is partially related to the design of my chair, but I feel the manufacturer/seller needs to be more upfront about which types of chairs this support is meant for. More specifically: the back of my office chair curves in slightly, which means that the bottom-center section of the product sort of caves in away from my back. I placed a rolled-up pair of pants in between my chair and the product in order to get more support, but this increases the slippage I mentioned above. 3) The upper-middle section of the product sticks out TOO much, causing slight back pain in a different area than I had previously experienced. Three stars instead of two because honestly I didn’t see a lot of other products on the market that seemed like they would do the job; this one at least provides some support. ..More