It started to cause such a massive shed that I didn't stick it out to see if it would help.
But be warned, even for those that it does help, it has a reputation of wrecking the hairline. I remember "B Spot" confirming that many that took it reported the same thing.
The pictures I've seen seem to really help the crown a lot... I mean a whole lot, but the front, not so much. But if I can thicken up the crown/vertex and get a HT just in the hairline, well, that wouldn't be so bad either.
I'll be waiting about a year to see if it does anything. Assuming it doesn't, though, I want to be ready to make a switch quickly, rather than crying over it not working, which would... happen anyway =P