This works as a great muscle memory reminder to sit/stand straight.
This is very comfortable and works to keep you from hunching over.  I use it several hours 5 or so days a week and it is comfortable and sturdy and I find myself remembering to not hunch over when not wearing it.  It is too bulky to wear under clothes so not for outside wear in my opinion.  I did put it on wrong (had the straps wrong so it rode up in the back).  Figured it out and now it stays in place and does it's job.
Rating: 4 stars