I saw an advertisement for a new tool just like this on TV and I thought I really need one of these for my toolbox. Now don't get me wrong I have no built one thing yet, but I do want to build one big book shelf. Have'nt gotten around to it as yet. Back to this tool. This duplicator is awesome as it give you the pefect template to use to make your project a success. It traces pipes, corners, tiles, frames, anything you stick it around for it to copy the exact lines within its sliding grips that you would trace the molding the tracing captured. I wold definitely be buying more that are a little bit bigger.