I used them for a few years. They are rugged, but I eventually decided they were over-wide for the 55# bow and cedar arrows I was using. I switched to narrow heads (RibTec 125S - about 1/2 the price as well) for full penetration. Lately I use Stos and Magnus II.
I took a steep downward shot and dropped a deer - but he regained his feet and stumbled off with two feet of arrow sticking up between his shoulders. I spent three days of a canoe-in camping hunt searching for him through a swamp and never recovered him (a beautiful eight point). Bad angle and my fault - but I switched heads as part of my penance. I also swore off near vertical shots. Confidence is a large part of successful bowhunting.
They'd be the berries with a 70# bow.