After reading the first thread, I ordered one too and just received it yesterday. I only tried it so I haven't given it a fair chance yet but so far I'm not sold on it, so far I much prefer a good old file for deburring sign substrates. It seems like something you just need to practice with to get the right consistent result, it's not quite as easy as the videos make it look. It doesn't seem very good for softer material either like PVC, which it just digs into if you press a little or it just chatters on the edge and makes a bunch of cuts on the edge if you use it too lightly.