I have a Savv VAC-5000. I don't have it installed permenantly yet but I've played with it a bit.
Nice wide angle picture. 150 degrees horizontal.
Color/BW Works well in low light levels.
Heavy duty weatherproof case and shield.
A little pricey, or were anyway. I got mine on ebay for about 100USD I believe.
The picture can sometimes be a little noisy. Might just be interference though.
There's some fisheye distortion but you can't really avoid that with a wide field of view.