Pillcam

I understand the main benefit of a capsule endoscopy (pillcam) over a regular endoscopy or colonoscopy is checking the small intestines, but is a pillcam sufficient for images of the throat/esophagus and stomach, and colon? Would it be able to catch ulcers, inflammation, etc in the upper GI areas? And colon? Or is the camera often dead by then?

Besides the small risk of the capsule getting lodged, what is the risk of ingestion of components of the pill? Microplastics? Metal? Battery? Etc.

Are there specific brands or models of pillcams that are better than others? Which ones record videos instead of just photos?

What is prep like with pill cams?