Not typically a fan of ACE but I have to say that looks pretty clean. I do like how they've added D-ring mounts to the center of the frame rails - this as opposed to having them on the outside. Got any details on how they're secured to the frame?
Darn, my search-fu was weak! I tried to find opinions of Ace on here and came up empty so thought I'd give it a whirl.
On the JL version it's all 1 piece. The section behind the D-ring mounts is boxed and slides over the frame rails. On the driver side you use the stock hardware from the factory tow hook (bottom & side). On the passenger side you use the stock bolts on the side and the hammertown armor comes with bottom hardware (a small plate with 2 threaded holes that slides into the frame rail since the holes on that side aren't threaded & washers/bolts).
Here's a couple pics, Eddie.
driver side w/ all factory hardware
Passenger side w/ factory & Ace hardware