I was getting grainy and intermittent dark images on my monitor. Cleaning the connectors helped some but the intermittent problem remained so I contacted the mfgr, Motion Analysis, and they offered to check it out for no charge. Found that the video board was shot and a replacement was $400+ (ouch!).
Opted to go with a Sony 420 TVL for <$60. I had to fabricate a mounting bracket out of Al angle to mount it and play with the tilt angle to get the view set so I could see beyond the back of my toad. This was important as the Liberty has a failure mode where the rear glass will open up while moving. Image is crisp and colors are sharp. The grid lines (3', 5', 7', & 10 ') from my folded tow bar are not distracting. Oh, also had to add a voltage regulator in the supply line.
The camera came with IR for low light viewing. But since IR doesn't penetrate clear plexiglass I get a washout effect at night. Haven't tried it on the road yet so don't know if approaching headlights from rear will be enough light to turn off the IR LEDs. I tried inserting a light source near the camera but couldn't get it to work. I could get the IR ligts out but then got a reflection of the light source on the plexiglass.
If I was to do it again, I'd get a non-IR with a tilt-able mounting fixture. But overall I happy as most driving is in daylight.
Steve