I have used a 4X4 (unsure of brand but has horizontal foam sheets of varying thicknesses), Morell 6 shooter, and Field Logic Black Hole... The first two will stop a broadhead, the 4X4 you will never get it out and target tips are as bad, The Morell works decently and still mostly stops broadheads but it leaves chunks of its layers all over when removing arrows. It also kind of melts the green foam inside onto your arrows which then have to be scraped clean. The Black Hole was much easier to remove arrows than the previous two, but also left shards of foam layers all over when removing BHs. It also did not last as long as the other two, and the chickens like to eat it.
I bought a Rhinehart 16X16 last week and LOVE it!! I've shot BHs into the replaceable core and they pull out easily. The target arrows sink about 8 inches in from 20 and 30 yards and are relatively easy to remove. I think you would have to shoot thousands of arrows into this to destroy it with target tips. It is also nice and heavy and does not move when hit off center. I've sent a couple target arrows through the edge and one inch of this foam prevented the arrow from passing through (65 lb Bowtech Invasion).
I struggled over the cost of it for a couple of weeks, but think it is worth the money. If you have a big field to shoot in, the 18-1 could be fun to be able to throw downrange and practice at different distances but it just didn't offer a large enough single plane impact area for my needs.
Hope this helps
