Well, in this case it's kinda made to detatch (though I've never had it happen by accident yet), so it's very easy to put back on. It's also easily replaceable if it does break.

But it feels pretty sturdy to me, when I peel it away. It's also flexible, so I doubt it'll be snapping.

No, if the magnets are lined up there's no gap. I count 20 magnets, which holds it in place pretty securely unless you're intentionally trying to take it off.

Speaking of which, the top cover with the keyboard is actually magnetically attached to the bottom half, but also screwed in. That makes it easier to align it when putting the laptop back together.

I have the 12th-gen 1240P; it's the lowest tier of 12th gen but still has 12 cores so I think I did pretty well. Four E, 8 P.