Title: Not very useful
Review: A good idea that doesn't work very well. The reason for such a device is to acurately mark the cut line. This product doesn't do that at all. Due to its design, the line it marks is inherently offset from the edge of the blade. There is no adjustment and I don't really see how an adjustment could be made. Even if the alignment were good, you still have the issue of adjusting your cut while the blade is spinning since a centrifugal switch turns the laser on. The unit did fit my DeWalt without problem, but the mounting hole was much bigger than required and I don't have much confidence that the unit was centered on the arbor which could affect balance.
Is this product review negative?