I bought one and ended up returning it. :-[It's great for seeing inside walls before you cut but the resolution for anything further than a a foot was very poor. It may have been just me but 1/2 the time I could not tell what I was looking at. If I'm going to cut a hole to snake the camera in and have to patch it later, I decided it was easier to cut a larger hole to look in, which for me was easier to patch in the long run. Just my opinion; seems other like it. I'd try it and if does not work out you can always return it like I did.
cheers!