I've only just started using them but so far they're holding up well (at least on the cardboard back of the pad) and the elastic is strong. My grip is a little wider than average and fits snugly into the elastic. I've attached the mount to the inner lid and feel a slight lift, but they're thin enough that I don't think they'll be very intrusive when typing in that area. The pen got stuck in my pocket a few times when I pulled out the notebook and the holder didn't detach or fall out at all. In general, I think they are very important.
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