Yes, I have taken MigreLief. I took it for several months. You do need to take it for at least 3-4 months before it takes its full effect.
The bad news is that it didn't help me, but the good news is that there is very good research behind it, and it's helped many, many people. Dr Robert Kirshbaum from California, for example, claims an 80% success rate.
Good clinical studies have been done on all three of the ingredients in MigreLief. I would recommend it to anyone. It's better to just try the MigreLief rather than experimenting with the different amounts of feverfew, etc, since the research seems to point to the balance that can be found in MigreLief itself.
You could, of course, buy all three seperately. Just make sure they're from a reputable source, and that it contains the proper form of feverfew.
I wrote a brief article on the supplement here, in case you're looking for more information: