I am a plumber and I will share my opinion. Terrible quality, especially the button. Is it possible that the only thing that needs to work properly gets stuck??? For me, very bad quality overall. Not worth it. Get Valsir instead, which is light years ahead

Very poor quality toilet, the flush button constantly gets stuck and sometimes pressing it causes the entire top lid to come off. Truly a waste of money, I don't know if it happened only with mine or if the company's quality is at this level, but I've had it for a week and I will buy another one, this one is going in the trash.