Looking for a new double oven and like the quality of Bosch products so am tempted by this. There is a £200 difference in price between the series 2 and the series 4 and the only difference I can see is that the series 4 has retractable knobs? Anyone got either series and would recommend? Not sure if it's worth paying the extra £200 for slightly more up to date technology and retractable knobs!!