We have the Ikea Rengöra in the tea kitchen. It cleans quite well, no question. It has been in use for about two years, sometimes running daily, sometimes only twice a week. So far, there have been no malfunctions. In the rented apartment, we also installed a Rengöra about a year ago; there was a problem with an error message in the spring. So we went over and took a look – well, it had washed a granite board and one of the glued rubber stoppers on the underside of the board had blocked the pump. Once that was removed, the dishwasher ran perfectly again. Therefore, I can say nothing bad about the Ikea dishwashers.
And now the big but: A few months ago, the old Siemens dishwasher in our regular kitchen broke down. We thought about it for a long time but ultimately decided on a Siemens because of the good features, not an Ikea. Also because in the main kitchen, more difficult dish stains are to be expected, such as greasy pots, oily dressing-mix glasses, burnt casserole dishes... the Ikea Rengöra sometimes has problems with these, but the Siemens does not. After several months of use, I am still very satisfied with the Siemens dishwasher.