Its a great target. If I had only one steel target at my home range to practice with, it would be a spinner. Makes you execute good fundamentals, 7 rounds of 115g minor ammo and its spinning.
I used to be like most USPSA people and think it was a gimmick, that you can only do it with major, yadda.
Now that I got the stick out of my butt, I shoot mostly 3-gun. I love the spinner, practicing on it made me a better shooter. Practicing on it with rifle made me a better rifle shooter. Now that I am doing more precision, Ill be shooting it with my bolt gun.
Start at the top, start at the bottom. Doesn't matter. Dont miss and time your shots so your not losing energy on hits past 90 degrees. Also square up to the target as much as possible, bullets lose energy when shot at a diagonal to the plates.
Great drill, plate rack and spinner. Shoot a plate in between shooting the top and bottom of the spinner.