I have a Sears "L'il Crafty" corded rotary tool I got for Christmas probably nearly 60 years-ago, it's still working. I asked for it to work on my slot-car set-up, and after that, it earned its place in my tool collection many-times over as it got me out of one jam or another. It's great for using the small-diameter cut-off wheels in confined spaces to remove stuck hardware.
Since that time, I've also purchased a couple Dremels, and I've yet-to have one burn-up. I don't abuse them. I have the flexible shaft for one of them, I use it on my #395 Dremel. I have the drill press attachment too, and the sharpening attachment for lawnmower blades. It's a great way to sharpen your chainsaw blades, little in life is as-satisfying as the use of a newly-sharpened chainsaw.
Here are some of my Aurora 'Model Motoring' HO cars I modded using my rotary tool, about 55 years-ago. I don't have the track set-up, but maybe one of these days, the 6 y.o. grandson might like to try it.