LEE graduated neutral density filters offer a solid range of stopping power without the color tint that comes from using cheap off-brands. Image quality is solid, even with the higher three stop filters. The larger rectangular size is easy to use, even if you just want to hold it in front of your lens and skip the holder for a quick shoot.
While the image quality is definitely solid, some consumers have reported that the filters scratch rather easily and may bend under extreme temperatures. Coming from a luxury filter brand, the filters typically cost $100 each not including the holder, which can be a pretty tough price tag to swallow.