Are cheap non-Dremel rotary tools any good?

Budget cordless kits from brands like HOTO, HARDELL and Fanttik post respectable ratings on large volumes, and they're popular for light crafting, 3D-print cleanup and occasional engraving. However, this data set contains no independent testing to confirm motor durability or runtime claims, so they're best viewed as low-commitment entry points rather than tools for heavy or professional use.