I have 2 of these, one housing a mandolin, the other a concert ukulele.
I have found it extremely stable, the foldability for travel being a great benefit. The stand is a little too big to put into a large pocket of an instrument case, but it is light enough to add to a strap or carry by hand. For taking in a vehicle, it is very compact and space saving.
I use this for a main stand at home as much as travel. With the instrument on, it shows the instrument off well and lets me grab those few minutes in the day for practice without worrying about storing it otherwise.
It is primarily for the smaller instruments, I have an octave mandolin, which whilst it would hold the instrument nice and stable, it is a little wider than the stand is designed. The front round protectors can be adjusted for different depths of instrument body.
Overall, a great quality stand, I now have 2 and would happily buy more when the need arises.