I found this camera extremely helpful for DIY sewer maintenance. It makes a huge difference to know what is going on in there vs. guessing. Cons: instructions are poorly translated / inaccurate as you would expect from just about anything you buy on amazon. Example: what is said to be a green light when charged is actually a blue light, on / off switch is labeled off/no, that sort of stuff. The screen is small but usable ( think early smart phone size) . the charging port is slightly misaligned with its hole in the case, so there is some jiggling involved in the plug in process (be gentle). The push rod coil is about 3/16" (5mm) so I'd call it usable but delicate. I've only used it to 15' and a few elbows deep. Hard to imagine it going 100' around a bunch of elbows but I haven't tried it yet. Battery is internal so not sure how that goes at end of life.Pros: Picture is clear and if the water is clear in the pipe you can see reasonably well under water ( i suggest getting it opened up with a snake first so you can flush out the murky water). I could easily identify large roots that had been cut through and smaller roots like hairs hanging from the top of the pipe. It is light and small, easy to carry.Tips: Tread lightly, I personally know several plumbers who have gotten their cameras stuck and had to break concrete and dig too get them unstuck. watch for holes in the bottom of the pipe that the camera can fall into and get snagged when pulling back. I'm not sure what the threshold is for how hard you can pull before the camera breaks off of the push rod, but I am sure there is one and you will be sad if you exceed it.