I bought this plate joiner about a year ago, and it has become a regular part of my woodworking activities.  It adjusts easily for doing either straight plunges in a 90-degree edge, or for plunging into a 45-degree  mitered edge.  This is made possible because the fence adjusts to any angle  you would ever need.  The blade goes a long way before it dulls -- I used  mine for at least six months of regular cutting.  The saw has solid  adjustments for bisquit sizes (#0, #10, and #20, as well as a kind of  "open-ended" size that I don't really understand very well) --  you just have to turn a little knob until it clicks into a clearly marked  bisquit-size setting.  It handles better than other plate joiners, since  the body is longer and the handle is in a better location relative to the  mouth.  There are clear, red lines on two places on the plate joiner to  align with your bisquit marks, whether you are using the machine  horizontally or vertically.  The only negative I have to point out about  this plate joiner is that it doesn't have a great dust-collection system,  and also dust collects in the blade opening a little more than other plate  joiners I tested.  Every four or five plunges you have to either vacuum out  the dust, or run the machine in the open air for a second to clear it.  This is a small matter when you consider how nice the finished bisquit  joints look.