From my experience they also worked on others, it takes few listening and effort to allow entrainment as it is subtle effect, but is definitely there.

After years of meditating, I made several focus and 'work' tracks that I use.

{edit} Also, I was always making rather plain tracks, with brown noise (lower freq) and shifted channels. This is a little different from actual difference in frequency, but to best of my knowledge works the same, also it is way more pleasant to listen to, which is important when you are trying to meditate.