I've watched and read a few reviews over the years, it looks very good for what it's meant to do.
The "genuine" article seems to work much better than the cheap copies you can find, especially in keeping its position.
I haven't got around to buying one, but I would like one for close up work on a tripod where I don't have a centre column: to adjust height as well as the distance to the subject by manipulating the arms. It also, of course, doubles as a "flat surface" mini tripod.
My concern is that it also looks a bit of a faff, to get into the exact position.
There is a recent review of it here:
View: https://www.youtube.com/watch?v=cQpmvVWEL0w