Just under a year, and I've been using it for posture (a really tough habit to break, at least for me), so I have a good bit of data.
If the problem is bad posture while sitting at the computer, you could try removing your chair's back and armrests. Once I learned how to sit right (with Alexander technique), I discovered that back and armrests are like magnets for my body, and they also make it quite easy to sit in a bad posture for a long time before noticing. Without that support though, a bad posture become uncomfortable much faster, and I soon notice and straighten up.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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