I’ve owned several K&M tablet holders. This is the second generation of the product that I have, and it is a nice improvement over the previous one.
I’ve now used this for over a year on a daily basis.
Adjustment in the X or Y axis are easily made and locked in, and they really stay. The tablet is truly secure, as long as you completely tighten the slide. I have occasionally lazily left it a bit loose. The only problem is that the tablet leans a bit, but it has never fallen out.
K&M makes fantastic products, and this one is no exception.