I have a Jandd rack, it's very sturdy, but the only draw back is that it makes fixing a front flat very difficult when using wide tires and long cantilever brakes. When I had narrower tires, the long cantilevers would release far enough out, before they hit the rack, letting the wheel/tire slip past the brake pads (still had to completely remove the skewer pin).
Now that I have much wider tires, I have to partially remove the rack to let the cantilevers spread out further, letting the wider tires slip past the brake pads.