... device is as simple as it looks and does pretty much what it claims
The device is as simple as it looks and does pretty much what it claims.  It's not particularly uncomfortable although it can be a bit difficult to take off if you wear it as snugly as recommended.  The only thing keeping me from giving it a 5-star rating is that it just isn't that spectacular.  It will help you be aware of your posture and help you maintain a better posture, but it's not going to change your life by any means.
Rating: 4 stars