A cautionary tale:
I've recently acquired the basic Lee (no filter slot, as I have a full set of screw in ones). What has happened -- twice, as I am a slow learner -- is that when in portrait format and employing front rise to a generous degree, but well within the lens image circle. that I have recorded an excellent, though soft, image of the lens hood at top of frame.
The Lee is, BTW, square.
This occurred with a 5x7 Shen Hao, also a recent acquisition, which has, relative to my 4x5 Wista, a not so bright ground glass image (and a less than bright operator!). I did sight the clipped GG for vignetting through the lens, then fitted the lens hood at an extension which I had figured when playing with it before shooting and at ZERO front rise -- to be OK.
Fortunately my subject ain't going anywhere fast, so it's back for another try when the light is right.
The Lee hood seems to work fine, is compatible with their slip in filter systems which are likely easier to use than screw in filters, and rather more economical than a number of the other brands.
Regards - Ross