Inada 3A Massage Chair
I've used this chair for 2 weeks straight and found that it is making a significant improvement to my posture. I work at a computer all day and I normally slouch quite a bit. At first, the stretches that the chair does made me feel taller immediately after the massage, but then I'd go back to normal shortly afterwards. But after about ten days of use, it started to take a longer-term effect, and now I find that it's easier for me to sit up straight while I work, without feeling tired or awkward.