The ability to run Windows directly from a USB flash drive (often called "Windows To Go" or a portable workspace) has moved from a niche IT trick to a mainstream utility. Whether you need a backup OS, want to troubleshoot a dead PC, or prefer to keep your work environment in your pocket, booting Windows from a USB drive is a compelling option. But how well does it actually work? This review breaks down the practicalities, performance, and pitfalls.