The JOBO 2509 reel requires about 1.3 L of liquid to cover the film, so a little more than the Paterson. If you're using very dilute developer, the extra volume could be a bonus, though. The JOBO is different from the MOD design in that each sheet is fed into a short spiral rather than bent into a "taco" shape and held at 2 edges. Because the JOBO tanks were designed for rotary agitation, the drum has a large diameter and the film sits as closely as possible to the drum wall, with quite a bit of space in the center.