If I could just add to your file of anecdotal evidence, I do suffer from back pain from time to time, and it is generally mitigated by either sitting bolt upright or in a super reclined state. It's the inbetween states of sitting that are most likely to bring the problems on, in particular leaning back at about 10 to 20°, even with a chair back.
Don't forget to get your levitating mobile chair (with cup holder!) from BnL
Also in the news "standing desk stocks suddenly plummet"
If I could just add to your file of anecdotal evidence, I do suffer from back pain from time to time, and it is generally mitigated by either sitting bolt upright or in a super reclined state. It's the inbetween states of sitting that are most likely to bring the problems on, in particular leaning back at about 10 to 20°, even with a chair back.