I bought this because it handles four different drill sizes, enables dowelling of a good length with one set up and, when compared with the competition, has a good price. The design is ingenious. My concern when selecting the device was would it be accurate and robust enough to give consistently good results. My answer is a resounding yes. I have made a number of edge to edge joints using the jig without any problems. One joint required the jig to be relocated twice to cover a dowelled length of 1.5 m. I did this by eye only, without any marking, and the dowels lined up perfectly. This jig is easy to use and gives excellent results.