I waited several months for Zagg to come out with a good keyboard/cover for the (then) new iPad Pro (2018) 12.9" screen. Their product development decision was to make a two-piece cover with keyboard. I wasn't happy with the detachable nature of that keyboard, and it came apart when folding it fully back (like a sketch pad). Given Logitech's brand reputation, I figured I would be safe getting a product from them.
Wrong. Sort of.
While the material for the part that holds the iPad is good, and the keyboard itself is solid, it's unique magnet system is the weak point. Logitech designed the cover with strong magnets at the bottom that, when placed over corresponding magnets in the keyboard, turn on the keyboard and trigger the bluetooth module to initiate its connection to the tablet. It is a solid design, much more reliable than a physical switch, and it has the advantage of being a reliable way for the keyboard to conserve power: if not connected --> turn off the bluetooth. Easy. Smart.
However, the magnets themselves are held in place on the outer cover only with a thin strip of plastic-like material, like a thin piece of vinyl. The magnets are so strong that they resist being removed from their counterparts on the keyboard. Over time, the vinyl stretches and eventually fails. The result is that the magnets stay stuck to the keyboard, and the recesses where the magnets are supposed to be become exposed. (See pictures.) For me, with casual use of the tablet, it took about 5 months for the wear to become noticable, 3 months after that, the first magnet failure happened, 3 months after that, the other side's magnet failed, and then about another 5 months before the repeated failures reached the point that it is now more hassle than it's worth to keep the cover on.
Another problem with the magnets is that they are strong. Really strong. They're so strong, in fact, that they click almost violently into place. Sadly, they are not sturdy; the magnets eventually snapped. This compounds the problem noted above, because when the magnet pieces need to be put back into their recesses, there are two or three that need to be put back.
The "fix" is to use glue to keep the magnets in their respective places. Perhaps Gorilla Glue, Krazy Glue, or some other brand of cyanoacrylate (CA) glue will be strong enough. My concern is that even if the glue holds the pieces in place, repeated 'clicking' together of the magnets will likely eventually break the glue's bond.
Fortunately, I bought the 2-year support plan. For about $24, a buck a month, product failure like this should be covered.
So, what did I do? Glue it or exercise the protection plan?
I went back and got another one. It turns out that there are no other 2018 12.9" iPad keyboard-case combos in stock at my local Best Buy that are sturdy enough to be called "protective". The basic Apple product is a thin plastic with practically no protective value, and the other cases out there just don't have the same feature set. So, I'll get the best one for my needs, pay the protection plan fee, and rest assured that even if it blows out again, I'll at least be able to get a refund. Maybe in 18 months, there will be a better option.