Anyone actually running a Keel Guard on their Jet Ski?

Overtons has a deal where is comes w/ the scuff buster.

tack on or just plain tacky?

curious as I think the idea is cool, but want to know how well they really hold up, especially in salt water. Also if they effect speed in any way?
Just got another ski & the keel/paint is in pretty good shape, I'd like to keep it that way. I ride often & park on a EZ dock. the keel rides up the dock.