Many times, for things like these you should try doing your own testing, as your results may vary from others who may share their experience.
Perhaps someone says it doesn't work for them, and instead of trying for yourself, you take their word and don't even bother.
Or maybe it's the other way where someone says it works for them, but upon trying yourself, you see that that you aren't getting the same results. So you may think that they are lying or misleading you.
The best thing to do in a situation like this is test, test, test.