So I just don't get Oscillating Multi-tools. However, they seem pretty popular with all the major brands have one or more in their tool line up, along with main stream tools like drills, sawzalls, circular saws, and the like. I understand they've got a bit of a niche when installing flooring, and getting under trim and the like. Otherwise I do not see people using them, and I watch a lot of youtube videos.

So it seems a very niche tool to me, and some of it's operations I can do with tools I already own, like random orbit sanders, grinders, or even a Dremel.

Is there some really awesome task these tools excel at that's common place, or at they more like those right angle drills, a perfect tool for it's niche, with high demand from pros doing that job?