Today I got to test out my new Veritas Small Plow Plane. It's an unusual looking plane that is designed to form grooves (primarily rabbets parallel to the grain). I used it today to form a 3/8" wide by 5/16" deep rabbet to receive the base panel on the wax melter project. At this it was quick, easy and efficient. Compared with a electric router it was nearly silent, was faster to set up, and produced as good a finish without the dangers (to self and timber) of using a router.
The design is fairly simple. A cast iron body is attached to two fences one to control depth (which slipped on the initial cut) and one to control distance from the edge. The blade size sets your width and are available in 1/8, 3/16, 1/4, 5/16, and 3/8". The brass locking knobs are easy to use and are comfortable to the hand. There are screw holes to attach a nicer and wider fence, but straight out of the box the handles were comfortable and blade sharp.
An expensive tool, but a nice one. I look forward to testing it out on some huon pine tongue and groove joinery in a future project.