It is alot of fun! It makes a whack sound rather than a ring when you hit.
The majority of hits have been cheap 223 ball ammo at 70 yards give or take.
It has received a sampling of other calibers, 308, 9, 454.

The front view doesn't really show how tortured that metal is.
most of those dents have sharp raised edges - it would hurt to touch it the wrong way.