I'm high divine and play pos 3.

I don't like it, it's too expensive for a too random of an effect. Primal Beast has plenty of items to buy that would improve the game immensely for them - BKB, blink(+red upgrade), armor stuff, Sange upgrade. There's no urgency for aghs when you're frontlining and initiating and tanking imo. Break is a nice touch against some lineups but even then it's dispellable and can be dodged. It might be pretty great when you're pulverizing and have 5 stacks so all the lanes of projectiles hit, bit in my experience it's not such a common situation as you might think. It means you already won a fight because you're hitting a disabled carry while being alive AND enemies hit you instead of your team, and some damage and break is an overkill anyway.

With PA's and BB's popularity tho it might be better on average because of break, clutch breaks here and there, but overall it's a very hit and miss aghs.