I installed the Rear Splash Guards and am very happy with the look, the functionality, and the ease of installation. Thanks to all the previous posts; the information was very useful and made a straightforward installation process even simpler.
I recommend removing the tire completely; it makes the install go so much more smoothly (read the owners manual carefully and follow all instructions). In fact you can turn the removal of the tire into an educational experience for the spouse, significant other, and/or kids. The joy of changing a tire! I installed the locking wheel lugs on the rear at the same time.
On the subject of the splash guards being standard equipment. I felt the same way when we first took delivery of the Pilot. I'd still like for them to be standard. However, I performed an unscientific survey (used by eyeball while driving around and walking around parking lots) and found that the majority of the non-Honda SUV's do not have rear splash guards. My assumption is that most manufacturers do not offer them as standard equipment. THAT'S MY ASSUMPTION BASED ON VISUAL SIGHTINGS. I COULD BE MISTAKEN.
In closing, I love the rear splash guards. We've also purchased the locking wheel nuts, rear cargo cover, rubber floor mats, cargo tray and SS touch-up paint (which we hope never to use). We'd like to get the auto rearview mirror next.
Thanks for listening.