The Powermatic 64B is a contractor-style table saw, and the smallest machine among Powermatic’s table saws. It shares a lot of similarities with the JET ProShop II (JET and Powermatic belong to the same company), with the 64B being finished to a slightly higher standard.
The main selling point of the 64B is that it has the size and body of a contractor saw, but the table surface and precision of a cabinet saw. It can be finely adjusted in all important aspects.
The standard model has a rip capacity of 30 inches, but this can be upgraded to 50 inches. The motor runs on 115V but can be rewired to 230V (instructions included).
In terms of features, the Powermatic has several improvements over the JET ProShop II. The handwheels are chrome-plated, and the miter gauge is of a higher quality. It also has a nicer motor cover (to more easily access the motor) and its fence has smoother sides. The 64B is about 30-40% more expensive though.
It is also quite similar to the Powermatic PM1000, which is essentially a cabinet saw version of the 64B. The main difference is that the PM1000 has a full closed base with integrated wheels, making it more sturdy.