I didn't shed. The first 2 months, though, I do remember having my scalp itch like a mofo. It eventually subsided after the 2 month mark, and has not occured since.
Shedding is simply a potential side effect for anyone that takes it. Some people get it, some people don't, but it should not be used as a measure of a products effectiveness, no.
Hell yes I shed when I started minoxidil. that should be considered a good sign, IMO. In the next hair cycle those hairs will hopefully be replaced by thicker, healthier hairs.