Got my hands on this from a deal wich included guitar strings, so basically, it just fell into my hands. I nice bonus I would say.
The bulid quality is good. Haven't tried a lot of Planet Waves products (all in all only guitar picks and this), but there haven't been problems with their stuff earlier and this is no exception.
The surface wich connects with the guitar is covered with rubber, so it doestn't slip, like, at all. If you set it on the fret, it will stay there untill you wind the bolt open, and take it off. And I can't decide if it's good or bad. Yeah, it doesn't slip, so the tone will sustain and the sound quality will be perfect, but if you want to get it off, or change frets while playing, it will cause a headache, because you have to unwind the bolt for like 720 degrees, which will take a second or two.
All in all, a good choice for playing home or in a studio, but I would consider a different option for live gigs.