Its not bad, but really restricts some functionality.,
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This review is from: Kiwifotos Lens Mount Adapter: Allows Nikon F-Mount Lenses to be used on Canon EOS 1D X, 5D, 5D Mk II, 5D Mk III, 7D, 10D, 20D, 30D, 40D, 50D, 60D, 300D, 350D, 400D, 450D, 500D, 550D, 600D, 650D, 1000D, 1100D (Electronics)
I got this to mount my old Nikon lenses, and it works however there are some flaws.
The locking mechanism doesn't work all of the time, I find that it varies from lens to lens.
Also you wont have access to your electronic lens setting, for example aperture and Auto-Focus.
This is a good little adaptor for using your old lenses, but don't buy one intending to pick up lenses afterwards.