I started running the 1.5's last year. Because I spent days trying to tune and couldn't get my exodus BH to fly like my field tips beyond 40 yards. I took a doe at 20 yards, full pass through, didn't get to stick an elk. I also have 2.0's and plan to run those for deer and antelope, 1.5's for elk.
One thing I dislike about these is once they pop open, they lock, and requires messing with it, or using their tool to close it back. Also if you lose the tiny rubber band, you're SOL, gotta carry extra rubber bands. I had a sevr BH open on me in the field accidentally while on a stalk, so i had to stop and swap arrows. Also while putting them into my quiver, i have to do so carefully, else they open up.
If i can get my exodus to fly well this year i'll run those again. I had full penetration on a bull even though the BH bounced off the shoulder knuckle.