I've got on loan a 3D Connexion Space Traveller (£125 + VAT in the UK) and I love it! I've not used one of these devices before, but I find it completely intuitive. It also has some extra cool features like a toggle for controlling the position of a component, rather than for manipulating the display. e.g. add a component into an assembly, and use this function to orient the component into its correct approximate position, before applying mates. Just thought I'd let you all know.....:-) John H