I have three, upgraded from two. It's very useful when doing electronics layouting (one for schematic, one pcb routing, one full of toolbars). But I got the 3rd

I have three, upgraded from two. It's very useful when doing electronics layouting (one for schematic, one pcb routing, one full of toolbars). But I got the 3rd basically for free when a colleague upgraded, the quality of the toolbar monitor is unimportant.