The only problem that I have had with my cheapo machine bought at Asda some years ago is to do with the central bearing for the paddle. Over time it has developed enough wear and slack to allow the water (which you put in first in this machine) to start to leak out. It means that you can't put it on timer but have to start it off as soon as all the ingredients are in to minimise any water loss!
I suppose that I shall have to have a second repair session on it soon, I've already done one bodging job on it.