Well made, will likely last for a long time - good quality plasitc on the adjusters, metal everywhere else.
It can get a good tight hold on mic clips, and they lock quite well at the edges, they haven't slipped so far. Also it's very light so it should put less strain on your mic stand with the boom arm extended.
Although it does correctly state the dimensions in the description, I was surprised by how small it is - It's fine for most things I can think of using it for, but who doesn't wish for an extra inch every now and then?
It does a simple job, as well as can be expected, for very little money - no complaints.