I had an avulsion fracture of my right thumb. The Hospital wanted to put it in plaster, which I felt was excessive, and was glad when they recommended this to me as an alternative in my situation, it not being available from the NHS.
Snug, comfortable enough for all day use, and firm enough to immobilise my thumb and protect it from knocks. Easy to adjust and loosen for night-time wear, and easy to clean. I used mine for the best part of six weeks, during which time I worked for an extended period as a sports photographer, carrying a heavy SLR camera and long lenses for hours at a time. I almost felt naked when time came to leave my thumb to its own devices.
If your medic agrees, go for this. It's quality.