I have used the Primos Trophy Grunter for 2 years now. I like the flexibility of this call. The adjustable tube allows for a soft call to deep grunt call.
I have 2 experiences to note with this grunt call. Both involved bucks, a 1 and 1/2 year old and the other a 2 1/2 year old. Both responded to the call and came in on a line.
I have no experiences with this grunt tube that have busted or chased deer away. I use this call and a Wilson Game Calls Executioner on my hunts. Both work well and I like the differences in sound they make.