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I have the 12.9 iPad and if it can’t hold the weight if I want it all the way up. It’s fine low or an inch or two but any higher and it just slides back down. The tilt range is good. I like that it’s collapsible.
Not stable and iPad 12.9 falls if you move it the wrong way - you get a surprise when your iPad flies off of it. Very limited in what you can do. The "weight" doesn't help the balance - beware and don't rely on it.