Those layered targets don't usually last very long when you start throwing broadheads at them. I use bag targets for field points and will be picking up a blob for broadhead tuning since my old block 4x4 is finally shot out.
I ordered the 12” while I was on a temporary assignment and couldn’t bring my targets from home. It worked good for what it was. Mine was pretty much shot out after about 4-5 months. Maybe the 18” will last a little longer
I haven't found any target that holds up to broadheads for long. Just shooting a few at my Rinehart Tears it up pretty bad. I struggle to get a year out of one after using BH's for a few weeks. I have literally shot them into pieces and the shot the pieces.