Hi, this is my second purchase of two BackApp chairs, the first time was a few years ago, they still sit in my office but as times are quite different now, myself and my partners tend to work from home. We have a fairly open plan style of living so no real office area and were working from our dining table using the dining chairs, that lasted not a long time as we both within weeks, started to feel slight aches around our lower back area. We are both very fit and this feeling was not a welcome sensation. Problem now solved by the receipt of two new wonderful BackApp ergo chairs, one of which i sit on now! Mike (Dilke) dealt with the order for me and i could not have asked for a more professional and friendly service. Mike was brilliant and ditto the chairs. Thanks Mike!