Flipper action on ZT 0801 vs. 0600 vs. 056X vs. 0777

I tried an 0560. Felt good, but there seemed to be a "trick" to getting it to flip. Wouldn't go all the way, every time.

Recently compared a Southard and an 0801. The Southard didn't feel as smooth, and I only successfully flipped it once out of about 6 tries. The 0801 was fast as a rocket, and smooth as glass, every time. And the ergos felt perfect.
I don't own any of the three yet, but I think the 0801 is next on my list.