My home airport doesn't do Clear so I don't have that, but do have GE/PreCheck and I can't think of a better bang for my buck on any money I have spent in the last 10 years. I have walked into the airport where the normal security line is snaking literally across the entire terminal, and the PreCheck line has taken me a few minutes. I would say that on average it takes me less than 10 minutes to go through security. My longest wait this year was no more than 20.

And that doesn't even include the benefit of not having to undress. Just throw my backpack on the belt, walk through the metal detector, pick up my bag and keep walking.