Union's have always been awesome at Durability, So far the Flux's my friend has are holding out very well.
I dont see any issues with the ratchets or the action on them period. Everything is still working smoothly..
I would say yes: The RK30's are flux's best park binding. If you watch the video you'll see how awesome the highback bends.
The vid is right on their website.
Once you become friends with fear, you'll develop an awesome relationship with it..