I use the manual desk at standing height most of the time. At this height, if I really bash on the keys of my mechanical keyboard then I can see a tiny movement in the monitor (which is on an arm clamped to the rear edge of the desk). Otherwise nothing. I don’t normally bash the keys like I’m trying to break them, so yes, while it’s possible to make it move artificially, in real life I don’t see any movement.
Too bad ikea themselves do such a poor job at assembling their own furniture in the showroom then. Because of the wobble and the pain that it is to return ikea furniture without a car, I ended up spending half as much on a fixed bekant instead which is really good enough for my purposes as I don’t ever change the height anyway.
