I still own my Freud biscuit joiner. It rarely gets used, but sometimes is the "right" tool for the job. I'll use it to help with vertical face frame alignment for a built-in, for example, where the face frame is getting installed after the cabinet boxes are in place and secured. The biscuits help hold the assembly up while glue and 23 gage pins do their work. Another application I've used it for is to cut slots in the edge of a panel to assist with creating a floating edge not unlike a bread board end on a table where there is a cross grain situation. I had that recently for some edged panels that were to cap the top of some room-height storage areas in a kitchen with a lofted ceiling. The edges were VG d-fir to match other workin the room and had to be on both the front and one side of the panels. On the cross-grain side, the edge was allowed to float back from the corner using splines set in slots created by the biscuit jointer tool.
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The most expensive tool is the one you buy "cheaply" and often...