I used the doe decoy and can setup during the chase phase this year and had deer walk by without even a glance. Probably due to my setup however.

I used the can another time on 2 large bucks tending one doe and both were interested yet neither wanted to leave the other buck alone with the one doe.

The doe decoy on the other hand has worked darn perfect this year (after the chase phase.) I had 2 big bucks on 2 different mornings come from upwind along the same trail to my decoy (and within 15ft of my blind) just from the visual. No calls and the scents were all down wind of the bucks.

Can couldn't hurt I guess but I haven't seen anything to make me buy another one.