I've thrown both the GL Fury and Opto and GL Underworlds. I was actually pretty surprised how straight the underworlds would go when thrown on a low line hyzer flip.
Basically I've been throwing the fury on that same low line hyzer-flip and its been holding the anny and not coming out. When thrown high on a hyzer-flip (in the open) it flips up and rides right, then fades out a little, ending pretty straight (but I aim left to compensate the amount of turn...which there is a pretty decent amount...).
both discs are great for hyzer flipping. Both will likely stand and roll if thrown on an anhyzer unless there is a lot of air...