I just got a production 174g z heat, and found it to be too stable for rolling duties. Was really hoping that it would work from all the rave reviews of it, but unless I got some weird one off not sure if this mold is what I'd be looking for in a roller disc. For reference, I roll with max weight Icon Mongoose normally.
I think my Big Z Heat could be turned into a turn and burn roller pretty quickly. I shelved it b/c if I rolled my wrist over at all it would drift uncontrollably away. I had the opposite problem, I was trying to replace my first Heat that was dead neutral, like a beat Z Comet in driver form. I don't know what plastic it was b/c it was a tourney stamp but I'm guessing it was a Z. :\