I have the primos "great big" can. It works pretty dam good. Last year when I bought it I thought I had found the holy grail of hunting. Every time I used it for the first 3 days of the season a deer would show up, it was getting funny. My 12 yr old son shot his first buck last year minutes after using it. This year I have had only limited luck with it. I had one deer respond. I think its like every other good call on the market, at the right time on the right day it can be dynamite. This years its been the primos grunt for me but I still have the can in my pocket.