I tried it,and did not see any noticeable difference. It is a pain in th butt, I think anyway. I spread in on a piece of plexiglass and shoved in the entrance once a week.
It seems to me like it is vaseline with essential oils. It is very strong smelling at first, but subsides rather quickly.
A neighbor that introduced me too it swore by it, but then again he lost all 8 hives that winter. This was about 2 winters ago, and I'm not sure if he is still using it.
Your results may vary.