Just bought a used Window Valet from a gentlemen on ebay for the C5. Price was reasonable and the function is so cool. Just a plug and go sorta thing.
I'm sure most of the guys here are far more familiar with the Valet then I but damn what a neat, reasonable and efficient addition. Just plug it into the diagnostic port and she works. I am impressed.
I know you guys are gonna say "Ken I've had one of those for years" well why didn't ya'll tell me? (And I bet their is even a thread somewhere that praises them as I now do.)