Since Porter Cable has pushed its 7310 laminate trimmer as its primary trim router, the 310 has become less familiar with the general public but has remained the production stop standard for professional woodworkers. With its outstanding quality and precision construction, I imagine that the $159 310 is significantly more expensive to produce than the 7310, and is thus not at a competetive price point with the $100 trimmers made by DeWalt, Bosch, and others. Those routers are OK, but they pale in comparison with the 310. See my review of the 7310 for a critique of this second-rate machine.