I have all the three...
Manfrotto: heavy, bulky, the screws are extremely tight (but you can loosen them a little bit). Limited leveling degree... i.e. leveling within 5° or so.
Super rock solid.
Great for studio work, simply too heavy to carry around.
Nodal Ninja: lightweight, very nice and smooth operation. Quite large leveling degree.
Actually a perfect leveling base... BUT: you have to tighten the counter screws otherwise the base can have play... i.e. camera shake will be introduced easily.
With the counter screws tightened it's solid (for a MF camera with DB and a medium sized lens).
I use it in conjunction with a Novoflex pano base as tripod head for my Contax when shooting subjetcs that ask for perfect leveling but were I don't have to tilt the camera very much.
Cambo: entirely different league. Super smooth, relatively lightweight, no counter screws, very accurate, quite large leveling degree.
Absolutely worth the price!
It's constantly mounted on my Cambo WRS camera, however I also have the additional mounting and rail to mount the Contax on it (requires to remove it from the Cambo... this is why I mostly use the Nodal Ninja for the Contax).