As another reviewer has mentioned, these easily get jostled and the way to use them is to put pressure on the top of the unit to add or remove your watch.  I have 6 of these, one was DOA and Brookstone paid for the return shipping.

These might not be suitable for large watches such as 15mm+ thick divers with bracelets.  I have a couple of these and the plastic cover will not fit over them.

That said I find they are pretty good for the price and am currently looking for a wooden display case with a glass door to put them in so I can dispense with the tacky plastic dome covers.