I like tuner because they work. I shoot long range steel. I don't waste my time or ammo shooting 5, 10, 20, or what ever the group count is today. I only shoot groups when tuning. I set up 12" plates for sighters and shoot 4", 3 ", 2" and 1" at 200yds. I shoot Long Gong at 300yds 8", 6" and 4"...