"Very neat, simple plastic pipe slicer; a little expensive compared to it's copper-cutting cousin, considering it's of all-plastic construction. The raw materials cost must be much lower than a metal cutter, but there's no real difference in price between them.
A problem with these is that they flex, so you have to squeeze it slightly to get a clean cut. If you don't, it spirals down the pipe, giving a rough finish to the end. The blade blunts very easily if not protected when not in use (keep the blade protector it comes with!!) - just one accidental use on copper pipe renders the blade more or less useless - also, can't find replacement blades anywhere, though Screwfix says they're available..!"