Minolta to nikon lens adapter?

I have some old manual focus lenses from my minolta x-700 that i want to use on my nikon f-mount camera, i have read some forums and they say its impossible to focus correctly, but the 'Zykkor Minolta MD Lens to Nikon Body Adapter' claims to be able to focus to infinity without any glass components. What should i believe?

You very well know there's only one way to find out.

Find a store that has the adapter in stock.
Take the camera and lenses there and try it.