For home hobbyist and minimal duty use, a tool that doesn't take up space, a Dremel rotary is well worth it. They've been offering the portable jobbie for decades, regardless where made, do have pretty good reliability even on their cheapest units.
The Harbor Freight units might get you by but don't expected longevity and have really poor armature shafts and bearings. Discounts, for under $10 it might do for rarely using.
Last Christmas, Aldi foods had a nice kit with flex shaft, variable speed, assortment of arbors - wheels of all type. $20 or something near that. By far the best package for the money. Armature tolerance is on par with Dremel though not sure of longevity.
Though at the shop have commercial grade setups, and pneumatic with variable. Really a luxury. Needed for carbon fiber work.
Btw: Caveat using your electric tool working on carbon fiber.