I had a Hoyt Ultra-Mag at one time and it was mag. I never had an issue with it and it seemed durable as can be. I have never heard of any of the newer Hoyts made from Mag breaking but i have heard people talk of older bows breaking in the riser.

I believe the PowerHawk, and the SuperHawk are still made from magnesium. The SuperHawk has laminated limbs as well.

Derek