Eh.. I have a gfb response.. once the factory one started krooing and not holding boost i knew it was a goneburger..
Good thing is you can adjust it to full recirc, or full vent, or anywhere in between.
I have it full recirc with a bit of choo choo choo under light depress but the shudder is almost non existent.
It has a spring tension bolt at the top which can be wound in or wound out or you can purchase a softer spring.
When its 75% recirc and 25% vent it sounds nice with a PoPshhh.. some like some dont lol..