Basically there are 2 kinds of bending machines, a "Box Pan Brake" (or just "brake") and a "Press Brake".
The
box pan brake basically clamps the material and you lift an arm to bend the material. Bending 0.060 SS or .125 Al will require a fairly beefy machine, a few thousand dollars maybe.
The
press brake (the one linked is quite small though) uses a high-capacity press to mush 2 pieces of angle iron together, the material to be bent is between them and gets bent in the process. These are not much more than the cost of the press, several hundred dollars for a 25-Ton press for example (not highest quality though...)
The advantage of a box pan brake is that you can bend any angle from 1 to 120 degrees. You also have 'fingers' to clamp the material selectively, allowing you to bend a box or pan. The disadvantage is higher cost, and lower capacity.
The advantage of a press brake is simplicity, low cost and high capacity. The disadvantage is you can only make 90-degree bends (although you can make a fixture for other specific angles).