I live in an apartment with smooth granite shower walls. Other large suction cups hold up great and never seem to lose their grip. For me it was rubbish. It's nice, but actually reattaching the suction cups is almost a wasted effort. This is very hard. And all this falls off within half an hour, and there is nothing in it. At least that was my experience. I've followed the directions to the letter, double- and triple-checked to make sure I did it right, and even tried multiple options. I ended up just throwing it away and grabbing what I found in Bed, Bath and Beyond, which works great.
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