intermediate rider here.
I ride the 2010 response behind boat. its older model with foam and wood, but i have always loved slingshot boards.
Soft landings, super fun to press on the water and just play around with surface tricks. very fast ride.
flex really changed how i used to ride (for the better). overall i would describe "better" as more aggressive and fun, definitely fun.
personally i think i am looking to switch to a hybrid rocker line some day as i find myself enjoying both 3 stage and continuous. before the response i rode the original recoil and loved it, switched to the response because i was becoming more aggressive, especially in regards to speed and distance (line length and jump distance)