I had mine done. Noticable difference for the first year, water and dirt simply slipped off (no difference to the wheels though). 3 years on, it appears to same as my other non ceramic coated car.
Thanks for this Suffolk, I'll also be jumping on and grabbing on of these.
Quick question, if I unlock the car with the remote by pressing the unlock button once, do the windows drop down? Or do you have to hold the unlock button for the windows to drop?