I purchased a Zeus 3 30hz refresh rate. Knowing that 60hz is better, but here's my logic. Googling the speed of wild boar is around 11mph(sounds a little slow to me), the refresh rate is 30 times a second, which means the boar will tract 6-3/8 inches running flat out between each screen refreshing. This would be running perpendicular to your position. Any deviation would shorten this distance. I just couldn't see paying an extra 2K to shorten that distance down to a little over 3inches. My 2cents worth. Check my math and please correct if you find an error. The only thing I'm fuzzy about is the actual speed of the boar, they seem faster but at night and I can't seem to find my radar gun.