Several guys in our camp had Hoochie Mamas last year and got good results. I' m using one this year.
On my rookie hunt in ' 96 I used a Woodswise Hyper Hot Cow Call and called in a five by five. Everyone was suspect of it especially since I was a newbie. The next year everyone had one. Since then we have had good success with it as well. It has stopped running herds, frozen cows in place, and gotten cows to come towards us in addition to attracting bulls.
The potential advantage of the Hoochie Mama is that all you have to do is squeeze it. The other more traditional calls often require you to wipe off the reed when too much saliva gets on it.