I bought the hydra rev for $150 with the install tool. It was a good price so I just bought it. Now with my new setup, I am running superior springs and I thought about eliminating the hydra rev since I really wont need it, but after speaking with a couple of cam guys, it can actually save your motor. Let's say a pushrod gives out, in a normal scenario, the lifter in all likely hood would turn and cause catastrophic damage. But with a hydra rev kit, the lifter will still be seated on the lobe correctly, but you will no something is seriously wrong.