I KNOW 2 GUYS THAT HAD THEM AT THE NATIONAL LAST WEEK. THEY DIDNT GET THE COLLAR INTERFERENCE THE OTHERS GET BUT THE RANGE IS ABOUT THE SAME. NOWHERE NEAR 9 MILES!
Myself and 4 fellow hunters have them. They are by far the best yet! Collar interference is minimal, and the system is much more advanced than the 220/320 in my opinion. Highly recommended!!!