I originally bought this borescope/endoscope for a specific home project, but I suspected it would be very useful for several other chores and projects around the house. I was definitely correct and very glad I paid the little bit extra for the 16.4' of cable. I have used it to look inside walls for evidence of moisture, insulation, and even rodents; to look down or through duct-work for air returns and vents to check cleanliness; to inspect the insides of water pipes to check for blockages; and to look for gaps in exterior seals to prevent cold air, moisture, insects and/or animals from finding their way into the house.The 16.4' cable is great, but the length of cable plus the handheld monitor make it hard to manage by yourself, so having someone to dedicated to feeding the cable and another to hold the monitor is best. The screen size is nice and large, the picture has always been clear (unless the camera is pressed up against something or something got stuck to the lens), and taking pictures and flipping between forward and side cameras is very intuitive. Slightly brighter LEDs would be nice, but the three levels of brightness definitely help for dark, recessed areas.