Celestron XLT Coatings on Celestron CATS

I have a C9.25 that is perfectly collimated and provided excellent planetary
views and images, however this scope does not have the XLT coatings. I am
wondering how much is to be gained in performance by the XLT coatings. I
have seen many of these scopes flipped on Astromart and am considering doing
it myself, taking a small loss, and purchasing another C9.25 OTA with XLT
coatings and possibly carbon fiber. What does everyone think? Has anyone
ever done a side-by-side comparison of a Celestron with XLT to a Celestron
without XLT? What is the difference visually, if any?

Thanks,

-mij