I've thrown this disc now quite a bit - i'm still learning it, but have a good sense of what its like.
The Heat in Z plastic seems to be very reliable and predictable - when thrown flat, the flight is a fairly narrow S that finishes straight. Hyzer holds the line nicely and it handles wind well.
The feel in the hand is quite robust and chunky - no real perceivable flex/bend with a tight grip...it is asking to be thrown hard.