I have my 9500ix hard-wired high like jeremyc (but on the driver's side). Love it. See the How-to section.
Nobody can see it there, including cops that pull you over and parking-lot thieves.
With the auto-learn, it never goes off around town except for a cop. I drive by every shopping center and drug store dead silent. Today it picked up a highway cop around a bend, up a hill and behind a bridge. Not bad.
Do a search on radar detector here, there have been a few good debates in the last 2 years. No definite winners, only strong opinions.
Monaco Blue/Savannah Beige 135i